Liberalism (really, leftism and all its pet isms) is a (serious) mental illness.
Objective reality exists, and they don't "believe" in it.
Liberalism is more than just a mental disease; it is a sickness of the soul.
Hippies, Hookers, Hypes and Heathens, Hostile and Heretic, out-Herod Herod
.... and so on.