I agree they would be useful tools for someone with better organizing/political/govt. skills.
The terrible gap I have seen in all of these militia-types is they are not trying to form a government or replace with any kind of coherent…Rule. They just want to destabilize and destroy and leave anarchy and strong-man rubble rule. If they have even thought that far ahead. They don’t have any aspirations or tools for dealing with trains, planes, grids, etc. Neither do any of the regular knuckle-dragging Rube voters who just continually chant for destruction.
About their belief system…sure we can attribute some of it to mental health, but I know plenty of perfectly sane and functional people who fall into the gun trap. It is an addiction. It short circuits, and short-cuts all the normal ways we civilized people have to deal. No long struggle, no big lifts, no planning, implementing, organizing, and hoping to make life better for the majority thru hard effort. It is just main-lining this kill-them-all mentality and they just convince themselves civilization will degrade down to the level where their guns will make them kings of the pile.