Trump sought and actively tried to subvert constitutional government and overturn the results of the presidential election. And what he could not do through the arcane rules and procedures of the Electoral College, he tried to do through the threat of brute force, carried out by an actual mob.
In the 50s he'd have been called a commie traitor. Because of Russia and that period of our relations - which were bad. and all. And back then we used to fry traitors and spies pretty much on the spot. Before they could do too much damage. We're kind of "too late" with trump the traitor it seems.
Trump's guide Roy Cohen literally helped Joseph McCarthy start the red scare and the velvet purge despite he himself being a "friend of Dorothy"