What is political power? God has ordained it. (Ro 13:1) What is its purpose? What’s the ideal form of government?
Asked another way, if people were basically good, loving one another as themselves, what need would there be for a state, rulers using force to ensure compliance to law? What needs to be done which cooperatives, charities and businesses couldn’t do more effectively?
God says rulers are His servants, commissioned to punish evildoers. (Ro 13:4) To do this they need an army, police, and the right to use force. And we must pay them for doing it. (Mt 22:21)
Authority to collect money by force is perhaps, of all power, the most easily corrupted. If government officials are also people, then they’re also prone to evil like the rest of us. The more they do, the more money they require, and the more influential and powerful they become, and the more likely evil people will find a way to harness this power for selfish ends.
To be healthy, government must be limited to the role God’s given it, and its powers divided and balanced to limit the effects of corruption. Outside a divine theocracy, this is the model I find in Scripture: limited government with separated powers. Levites were God’s judges, keepers and interpreters of the law (De 17:9), while city elders and governors enforced compliance to it. (De 22:19-19) Levites had no power to collect money or create law, and no one had authority to violate God’s Law. (Ro 13:3)
The focus of government should be to protect people, punish evildoers, and praise those who do good. (1Pe 2:14) The closer to this model we can get, the better our government will be.