Not just that, but even many otherwise very principled leftists do not think critically about some of the more deep-rooted Enlightenment-era values. You don't take off the glasses to see through ideology. Fascists don't diverge from a pre-ideological, objective reality, they aren't simply misinformed; they enjoy fascism. To quote Anti-Oedipus: "Hitler got the fascists sexually aroused." This is why tireless explanation alone does nothing to convince them out of their position, and possibly even feeds it. Žižek says a lot of silly stuff, but he's absolutely right in seeing the radicality in Freud and Lacan.