The way I see it is that "leftism" as we call it is the belief that man made beliefs are more powerful than natural truth. It doesn't matter what the natural truth is if you can get the vast majority of the public to behave as if it's not true.

It is driven by things like envy and resentment, but also ego and overconfidence. Obviously this house of cards will not last forever, but it may become big enough that when it does fall it takes the whole human race or intelligent life in general with it.