Leftist do not live in a real world. I would guess that’s what makes them crazy.
I have said that while conservatism is the politics of reality, liberalism is the politics of denial. Liberals often find the facts of reality inhospitable to their preference: which is a narrative that enables them to feel virtuous while disparaging those they resent and envy. To do this they erase the boundary between opinion and fact; when someone offers an opinion not to their liking, they accuse him of lying, as if their preferred opinion is not just an opinion. but factual truth. Conversely, if one confronts a liberal with unassailable facts, they will simply dismiss it as “your opinion.”
This is a pathological cognitive pattern which most likely belongs in the Axis II category of personality disorders.