Said powerful people know what these cheerleading assholes are good for, and have given THEM the intellectual hegemony in crucial ways. They boosted the dulling of the "left", which itself partly explains "dialectics" and Chomsky's wacky but intellectually fashionable stances on "mind" and language.
They ensured that no competent and sustainably masses-friendly "left" alternative ever broke out. There's pieces of it ripe for assembling (e.g. Wittgenstein), and the means of practically showing why things like "reactionary" "realism" fail (e.g. transhumanism), but few will ever pursue those well.