But if you believe the rioters were part of an attempted coup, trying to overthrow democracy and install Trump as a dictator while setting bombs to kill their opponents, that seems pretty crazy to me.

Of course, some people might argue it wasn't an attempted coup, just a mob of high-spirited protesters. Much like sports fans or anti-globalisation protesters will sometimes set a cop car on fire or smash up a starbucks, just in this case it was the capitol building instead of a starbucks. (personally I think this is dangerously naive; my impression is 'stop the steal' people are sincere and unironic in their beliefs)