The drum I will beat a lot is that you can’t understand either Weimar or Stalinism without the context of entire demographics becoming pretty comfortable with weapon use, violence, and death because of WWI. I’m not chill about any of this, but the analogies are only so useful.
I've been reading about Britain after WW1 and there were numerous cases of veteran-led riots, strikes etc that seriously panicked the establishment. Nothing on the scale of what was happening on the continent - or Ireland - but yeah, having lots of unemployed men with battle experience...
The modern example of this is going to be Russia and maybe Ukraine depending on how things go.
The moment you get a humongous amount of a country’s population ok with the idea of killing people to secure a political objective is when a civilization goes back to the jungle.