How should an American Christian respond to a totalitarian takeover by the left through, for example, election fraud? Here is how I believe Jesus wants us to respond. Obey the government (Romans 13: 1-2) and do no harm and, in fact, pray for those that are engaged in fraud (Matthew 5:44). I say "obey the government", provided that they don't command you to do something that violates God's laws, in which case, we must decline (Matthew 22:21). Jesus knew (knows) that this world is doomed (John 2:15-17) and beyond salvation by man alone. We must focus our energies on following Jesus' teachings and on bringing non-believers (Mark 16:15) to him. After all, what good is it to save our democracy (Mark 8:36) but lose a brother or sister's soul? Jesus did not engage in politics nor did he ever encourage his disciples to do so. As difficult as it is, we should emulate Jesus' example. And, besides, vengeance belongs to our father in Heaven! (Romans 12:19) Thanks for reading!
IMO it's pretty clear Christians are obligated to support the legitimate government, and with arms if necessary, especially if the 'revolutionaries' intend to murder Christians at the first opportunity. It is a myth Christians are commanded to stand around and do nothing in the face of robbery, murders, and violence against themselves and others. We know the Apostles carried swords, three of them, and one of those who carried one was Peter. It is also rubbish Christians are somehow 'totalitarians', which is of course utter nonsense; free will is very important in the NT theology, and so are individual rights.
That verse on rendering unto Caesar wasn't just some smartass retort. There is no requirement that 'Caesar' was required to be perfect; that is an impossibility and while Christians are inspired to aspire perfection there is no expecatations any will ever be. How many ever achieved it in the OT? The nature of both Hebrewism and Christianity makes neither a good fit for kings and feudalism, but that was the way of the world for most of history, so be it. See David's story for an example in the OT.