I think in general one of the sticking points for libs is the attitude of some Bernie-bros/dirtbag left as they called it and people like Hasan that unironicaly said exactly this, "the US deserved 9/11". Its been a talking point for years really.

Personaly I agree with this and I don't see any problem, I guess one issue is that many leftists still don't understand that violence isn't just justifiable, but sometimes necessary and sometimes literaly the only way. We have after all.

The talks about revolution, how to deal with class traitors etc this goes back to the 19-20th century, nothing here is new.

I think also before we even talk about American working class having to suffer as a consequence of revolutionary or just anti-imperialist actions from American capitalists enemies, in the 9/11 case specifically this is a false premise since both towers were realy just very high end financial/big corporate offices.