This isn't about ideas it is about calling for violence towards people. This isn't how you get Nazis this is the "you already have Nazis and need to do something about it"
Also, funnily enough, the proletariat or what's left of it, are the ones currently flocking to the right-wing extremist party here in Germany.
At some point speech becomes hate speech that actually hurts people. In Germany there are laws against that, I'm sure the US has too.