One of the things that stops us from preventing bad things from happening is the inability and lack of capacity to image HOW bad these things may be and HOW FAR humans will take things in extreme situations.
Complacency and comfort leave us vulnerable to them happening again.
One parallel I will note, is how there is very little evidence to implicate Hitler directly in atrosity. Its all indirect and delegated downward in the chain of command to allow room for plausable denail. He would indicate he had certain ideals and prefences, but not give direct orders to do certain things. It was up to those under him to decide what they should do to gain favour and achieve certain goals (which included forgetting the nasty inconvienent obstacles to that called humans rights).
Ideology and control by implication rather than explicit directive is very much whats going on now.
If you want a good point of reference for the Capitol Building Riots, have a look at the Reichstag Fire in 1933 BEFORE Hitler had dictorial control. The event was used PRECISELY to kill off opposition and accountability and to kill the last strains of democracy.
At this point in Hitlers career, I think parallels of where Trump is now are not so far wide of the mark.
I do think its possible thats exactly what the aim and ambition was to do. They wanted to stop the vote and the certification of the new president. They wanted a 'symbolic' attack on a state institution. There were numerous claims that it was someone else who did it.
Trump has widely tried to use executive power to bypass other checks and balances rather than go through Congress too.