Not really. This particular group declared themselves members of a terrorist organization. Explicitly.
Americans who declared their allegiance to Nazis weren’t censored - and I mean actual Nazis, during wartime and shortly thereafter. In fact, their right to parade and protest was protected. They had no problem supporting the killing of civilians to instill fear.
Unconstitutional. It’s one thing to support actions performed by others and different to commit them yourself. Once they say they plan to commit the same acts, that’s when I draw the line. “I’m glad they did” versus, “I’m gonna” are very different.