The way to tell if an intellectual is going to knife you is simple. What do they do outside of the university? Do they organise at grass roots level? Are they cadre in a political org? Or do they just posture at every election and protest to sell books?

There are some exceptions like how Chomsky had bad takes while being legitimately involved in material work, but Chomsky is at least consistent in his bad takes, he doesn’t betray his own stated values at a moments notice. (He’s always walked an inconsistent line of electorialism vs anarchism, for instance)