Back in the 90's, was down South, in a few States, doing the Civil War re-enactor thing. Would sit round the camp fire drinking the local shine with plenty of guys, who were quite capable of abusing just about any Amendment in the Constitution - though every man a Patriot - imagined or real militia men in real life.
They really didn't like certain people - Blacks, Asians, gays, liberals, immigrants in general and "suits". Particular animus was reserved for just about all forms of Government above say, the local Sheriff. Absolute gun nuts, with a host of decided victim complexes and grievances. Zero ability to look at things from the other side.
The raw material hasn't changed much, it seems. Just looking for somebody to prime them, make them ready......and set them off.