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.)
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.