The how is their words: Liberate. Sacrifice. Patriot.
This is a modern democratic country that raises children with stories of the War of American Independence and the acts of 'revolutionary' terrorism around it against an unjust government are the height, the best of what an American can be. Over and over, the battle of Lexington and Concord, the Boston 'massacre', King George III ordered the seizure of any firearms imported into the colonies, unfair taxes without representation (the latter of which the US is now the master at.) and so on. Many of the philosophy of that war are rarely touched on, but the violence remains in these types of groups today.
Violence as a viable praiseworthy solution is bred deep on in the bones in many areas and so many politicians have used and abused that over the years -- that they are just and their opposition is out to kill, maim, and destroy. One of the main concerns about next month is the legitimacy problem - that that concept has been fed in so much that no matter who wins, so many won't believe it - and then what's going to happen?
The comparisons to the former Soviet Union is interesting, I think there are parallels some parts of the Bloc. There are already many who have been saying the Union will dissolve for years now, though I don't think it's as soon as some fear, I think if/when it happens, the US is going to be far worse in terms of some taking radical terrorist actions when so many other Americans are just so worn out and tired by it all. Some I know are so tired that this horrible shite doesn't even come as a surprise as anymore. The most surprising part of it is that it happened in Michigan. If this was Oregon or New Mexico, which tend to more of an issue with these types and I think also have women Democrat govenors, I think it would have been even less surprising.