This is because of historical and current experience with it.   

The Holy Roman Empire was ultimately responsible for killing many people because of their unbelief or heretical beliefs

Islamic nations control the lives of their people with the threat of severe punishment or death for breaking sharia law.   

So, why would anyone recommend a theocracy as the preferred form of government?   

What makes a theocracy good or bad is the Law that it is based on and how breaking that law is handled.   

So what Law would a good theocracy institute and how would it deal with those who broke that Law?   

The Law of Spirit Of Life
The perfect Law Of Liberty

These two laws would serve as the foundation of all other laws.   

• Definition: A politically organized community or major territorial unit having a monarchical form of government headed by a King or queen

• First Reference:

  And Cush begat Nimrod: he began to be a mighty one in the earth. Gen 10:8

  He was a mighty hunter before the Lord: wherefore it is said, Even as Nimrod the mighty hunter before the Lord. Gen 10:9

  And the beginning of his kingdom was Babel, and Erech, and Accad, and Calneh, in the land of Shinar. Gen 10:10

• Old Testament

  And you shall be unto me a kingdom of priests, and an holy nation.     These are the words which you shall speak unto the children of Israel. Exo 19:6

  And it shall be, when he sits upon the throne of his kingdom, that he shall write him a copy of this law in a book out of that which is before the priests the Levites: Deu 17:18

  And it shall be with him, and he shall read therein all the days of his life: that he may learn to fear the Lord his Lord, to keep all the words of this law and these statutes, to do them: Deu 17:19

  That his heart be not lifted up above his brothers, and that he turn not aside from the commandment, to the right hand, or to the left: to the end that he may prolong his days in his kingdom, he, and his children, in the midst of Israel. Deu 17:20

  For the kingdom is the Lord's: and he is the governor among the nations. Psm 22:28 Jesus will reign over all kingdoms of the earth during the Millennial Kingdom.

  Pour out your wrath upon the heathen that have not known you, and upon the kingdoms that have not called upon your name. Psm 79:6 The Day Of Wrath is coming.     It will come sooner than most think catching them by surprise.

  The Lord has prepared his throne in the heavens; and his kingdom rules over all. Psm 103:19 The heavens plural speaks to the multi-dimensionality of the Lord.     the Lord is a Spirit and He exists in the Spirit Realm.     The Physical Realm is contained in the Spirit Realm.

  Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever.     The zeal of the Lord of hosts will perform this. Isa 9:7 Jesus' Government spans Heaven and Earth and is Eternal.     For a period of time He will sit upon the literal Throne of David in the Millennial Kingdom.     But even after the New Heaven And Earth are created He will still Reign.      The Zeal of the Lord is the Holy Spirit who birthed Jesus, filled Jesus, raised Jesus and Transformed the Body of Jesus.

  For the nation and kingdom that will not serve you shall perish; yes, those nations shall be utterly wasted. Isa 60:12 SpiritLaw, Sin, Death, Kingdom

  The word which came to Jeremiah from the Lord, saying, Jer 18:1 Created, Good, Work, Kingdom

  Arise, and go down to the potter's house, and there I will cause you to hear my words. Jer 18:2 When we understand our total dependence ont he Lord we position ourselves as clay on the potter's wheel.

  Then I went down to the potter's house, and, behold, he wrought a work on the wheels. Jer 18:3 Clay that has impurities in it making it unmalleable is cast aside.     The impurity that causes a person to be rejected is unbelief.

  And the vessel that he made of clay was marred in the hand of the potter: so he made it again another vessel, as seemed good to the potter to make it. Jer 18:4 Humanity was marred by sin.     Christ Jesus has removed the imperfectiion and made us New Spirit beings through His Word by His Holy Spirit.

  Then the word of the Lord came to me, saying, Jer 18:5

  O house of Israel, cannot I do with you as this potter?     says the Lord.     Behold, as the clay is in the potter's hand, so are you in mine hand, O house of Israel. Jer 18:6 Clay does not have Free Will.     It has no choice in the matter of what it becomes.     Not so the human who makes the choice between life and death in their decision about Christ Jesus.

  At what instant I shall speak concerning a nation, and concerning a kingdom, to pluck up, and to pull down, and to destroy it; Jer 18:7

  If that nation, against whom I have pronounced, turn from their evil, I will repent of the evil that I thought to do unto them. Jer 18:8 God does not repent because He never makes a mistake.     Num 23:19 Our Lord is disappointed when we are foolish, weak, unbelieving and disobedient.      In this passage we see how the law of God works.     When we repent and change our ways, we avoid the curse of the law and begin to thrive in the blessings of the law.

  And at what instant I shall speak concerning a nation, and concerning a kingdom, to build and to plant it; Jer 18:9

  If it do evil in my sight, that it obey not my voice, then I will repent of the good, wherewith I said I would benefit them. Jer 18:10

  Now therefore go to, speak to the men of Judah, and to the inhabitants of Jerusalem, saying, Thus says the Lord; Behold, I frame evil against you, and devise a device against you: return you now every one from his evil way, and make your ways and your doings good. Jer 18:11

  And they said, There is no hope: but we will walk after our own devices, and we will every one do the imagination of his evil heart. Jer 18:12

  Until the Ancient Of Days came, and judgment was given to the saints of the most High; and the time came that the saints possessed the kingdom. Dan 7:22 The Ancient Of Days is Word and Spirit.      Jesus is Spirit Soul And Body.         → His Spirit is the Holy Spirit    → His soul is the mind and heart of His Holy Spirit    → His body is the image of His Holy Spirit.      So, the Ancient Of Days that comes to execute judgment on the Day Of Wrath is Christ Jesus.      At the close of the Day Of Wrath Jesus will set foot on the Mount of Olives with His saints to celebrate in the Marriage Supper, setting up the Millennial Kingdom in the ensuing days.

  And the kingdom and dominion, and the greatness of the kingdom under the whole heaven, shall be given to the people of the saints of the most High, whose kingdom is an everlasting kingdom, and all dominions shall serve and obey him. Dan 7:27 The Most High God is Christ Jesus.

  And I will overthrow the throne of kingdoms, and I will destroy the strength of the kingdoms of the heathen; and I will overthrow the chariots, and those that ride in them; and the horses and their riders shall come down, every one by the sword of his brother. Hag 2:22 Jesus, Return, Goat, Kingdom

• New Testament

  And saying, Repent you: for the kingdom of heaven is at hand. Mat 3:2 repentance is responding positively to the Truth and willingly accepting it and its implications for change.      The Kingdom Of Heaven is the Lord the Holy Spirit who issues from the Spirit Realm into the Physical Realm.

  From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand. Mat 4:17 The first and last message that Jesus preached to israel was one of repentance.      Understanding the change; being willing to change and actually changing is repentance.      The Kingdom Of Heaven is the Lord the Holy Spirit who issues from the Spirit Realm into the Physical Realm.

  Your kingdom come.     Your will be done in earth, as it is in heaven. Mat 6:10 The Lord's kingdom is coming.     His will is for earth to operate like heaven where there is uninterrupted life, love, joy, peace, faith and blessings.      Heaven is the Spirit Realm from which our Holy Spirit Father issues into the Physical Realm.

  And lead us not into temptation, but deliver us from evil: For yours is the kingdom, and the power, and the glory, for ever.     Amen. Mat 6:13 Direct our paths so that we avoid evil.         → Who did Jesus reference in the opening to this prayer?     Our Father.         → Who is Jesus' Father?     the Holy Spirit.         → Who raised Jesus from the dead?     the Holy Spirit    → Who gave Jesus all power in heaven and earth?     the Holy Spirit.         → Who made Jesus King Of Kings and Lord Of Lords?     the Holy Spirit.      So, the kingdom is ruled by the Incarnate Word ( Jesus) by the power of the Holy Spirit.

  But seek you first the kingdom of heaven, and the Lord's righteousness; and all these things shall be added unto you. Mat 6:33 understanding and adopting this Spiritual Law is the secret to Abundant Life.      So, how do we seek righteousness?      We believe the Gospel and receive the righteousness of the Lord Jesus Christ by faith in Him.      The Kingdom Of Heaven is the Kingdom Of Christ in whom resides all power in heaven and earth.

  The Son Of Man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity; Mat 13:41 Jesus is telling us the order of things are the end of the age.     Evrerything that offends and does iniquity will be gathered and destroyed first.

  But Jesus said, Suffer little children, and forbid them not, to come unto me: for of such is the kingdom of heaven. Mat 19:14 We are all children in the Lord's eyes.     Not appreciating a young person's sensitivity to the Lord is a mistake.

  Therefore say I unto you, The kingdom of heaven shall be taken from you, and given to a nation bringing forth the fruits thereof. Mat 21:43 Israel was rejected as the heirs of the Kingdom because it rejected Christ Jesus whose Kingdom it is.      From the time point that Jesus spoke these Words forward, the Chosen People were not genetic descendants of Abraham, rather the Chosen People are the children of Abraham by Faith.      No Jewish person has been or ever will be accepted by Christ Jesus based    → on their genetics or    → their traditions or    → their Judaism A remnant of genetic Israel will be saved by Grace Through Faith In Christ Jesus.

  Fear not, little flock; for it is your Father's good pleasure to give you the kingdom. Luk 12:32 We must try to understand the depth, breadth and height of the Lord's love for us.         → He created us.         → He redeemed us.         → He filled us.         → He has made us His heirs.     Eph 3:19 1Jn 3:1 1Jn 3:2 This verse does not say the Holy Spirit wants to share His Kingdom, rather, it says He wants to give us His Kingdom.      That gift comes by being one with Him so that He manifests in us and through us.     We become part of His life and, in fact, He becomes ours.     Col 3:4

  Neither shall they say, Lo here!     or, lo there!     for, behold, the kingdom of heaven is within you. Luk 17:21 Holy Spirit baptism establishes the Kingdom Of Heaven in a person.     This is so, because the Holy Spirit is the Spirit of King Jesus.      The Kingdom Of Heaven is not so much a place as it is a state of existence.      We are born into the Kingdom Of Heaven as New Spirit beings by Grace Through Faith in Christ Jesus.     Doing so, makes us eligible for Spirit Baptism.      Heaven is the Spirit Realm.     We enter into the Spirit Realm in the New Birth.      Not understanding that relationship with Holy Spirit - being in Him and Him in us - is major doctrinal error explaining the weakness of many believers.      Many believers go about searching in groups or churches or through gurus to experience the Kingdom Of Heaven not realizing that it is in them and must be experienced and manifested by faith.

  Jesus answered and said unto him, Truly, truly, I say unto you, Except a man be born again, he cannot see the kingdom of heaven. Joh 3:3 Human beings are born with the Sin Nature - a corrupt spirit.     That corrupt spirit is dead to the Lord Gen 2:17.      By being Born Again of the Holy Spirit we can begin to see (understand and appreciate) the Kingdom Of God.

  Jesus answered, Truly, truly, I say unto you, Except a man be born of water and of the Holy Spirit, he cannot enter into the kingdom of heaven. Joh 3:5 The Sin Nature must be destroyed and replaced with a New Spirit which exists in the Kingdom Of Heaven.      The Kingdom Of Heaven is the Spirit Realm, which is a dimension of existence higher than that of the space-time continuum in which all physical life exists.      It is not possible for the purely physical to exist in the Spirit Realm.     This is why we must be born of the Spirit.      Being born of water means being born into humanity.     Angels cannot experience the Kingdom Of Heaven in themselves as Born Again humans may Luk 17:21.      If there is any confusion about the birth by water being Water Baptism the next verse clears it up.     He connects the water with the flesh.

  For the kingdom of heaven is not meat and drink; but righteousness, and peace, and joy in the Holy Spirit. Rom 14:17 The Holy Spirit is the Spirit Of Christ Jesus.     When we are In Christ we are in the Holy Spirit and He is in us.     It is by oneness with the Holy Spirit that we reach our design potential.      The Kingdom Of God is the Kingdom Of Heaven.     It is about relationship with our Creator, the Holy Spirit, by which we manifest His righteousness, peace, joy and love.      The Kingdom Of God is, first of all, in our minds and hearts.     From there it transforms our thoughts, our words, our actions, our very lives.     Gal 5:25

  For the kingdom of heaven is not in word, but in power. 1Co 4:20 The Word Of The Lord is the framework of the Lord's will.      The Holy Spirit is the power that effects the Lord's will.      In order to see results we must operate in faith in the Lord's Word, expecting that the Holy Spirit will perform it.      Faith in the Word and the Holy Spirit.

  Then comes the end, when he shall have delivered up the kingdom to the Holy Spirit Father; when he shall have put down all rule and all authority and power. 1Co 15:24 The Lord is Spirit.     For Him to operate in the Physical Realm He needs a body.     Jesus Christ is that body.      Jesus is the vehicle by which the will of the Lord will be accomplished on the Physical Realm.      The end of this age of the world comes when Jesus has destroyed all that opposes the Father.

  I charge you therefore before the Holy Spirit and the Lord Jesus Christ, who shall judge the quick and the dead at his appearing and his kingdom; 2Ti 4:1 Jesus is the righteous judge.     believers will stand before Him in His Judgment Seat Of Christ to receive a reward.     Unbelievers will appear before Him in the White Throne Judgment.

  And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever. Rev 11:15 This is in fulfilment of our Lord's instruction for us to pray that the Lord's will be done on earth as it is in heaven.      Many Christians push back on dominionism but the fact is that Christ is already king of kings and Lord of lords.     All power in heaven and earth has already been given to Him.      He left us in charge of His property until He returns.     We are His stewards and should already be ruling the nations as the head and not the tail.

  And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our Lord, and the power of his Christ: for the accuser of our brothers is cast down, which accused them before our Lord day and night. Rev 12:10 There is no more accuser before the Lord.     It is now a simple matter of Satan deceiving as many as he can before the end.