All the alt-right/reactionary commenters everywhere seem to think that it's clear-cut: liberals hate Truth in all its forms, and "elite" liberals especially hate it, and they simply want to speed the collapse of decent society with such anti-Truth policies.

This is, simply put, the usual rallying cry of hatred: the claim that the Enemy knows the truth but denies it; knows the good and hates it, deliberately works to corrupt it; etc. — see, e.g., Torquemada or Luther regarding Jews, Kramer and Sprenger regarding "witches", Lenin regarding kulaks; Pol Pot regarding intellectuals; and so on. It's not a factual claim based on evidence; it is a form of dark cheerleading.

(It is also not specific to a particular ideology or political faction — left, right, "Third Way", secular, religious. It is, however, a common precursor to the dark times when adherents of an ideology decide to stop arguing and start killing.)