It’s troubling trying to contemplate just how low they really are. Parasites should be a sub-category of liberals.
They believe that American capitalist freedom culture is the greatest evil ever visited on the face of the earth. They believe that, as a result, no action, no lie, no betrayal is off limits or immoral. They have convinced themselves that the vast "crime" of western civilization and particularly America is so evil, so grotesque, so corrosive and pernicious and inhuman, that absolutely anything that the imagination can conceive is justified in the struggle to gain enough power to defeat it.
This is their reasoning. Many of them are very damaged, unhappy, frustrated, alienated souls who feel that the world hates them, and therefore they have the right to hate the world. They displace their hatred of themselves on to the whole world, on to society at large.
In many cases they believe that the best way they can redeem themselves and imbue their lives with some meaning is to fight relentlessly against that which society calls "normality," even to the point of destroying themselves.