Theodore Dalrymple would say that the root cause is the inability of the liberal to accept responsibility for his own actions, that the liberal, just like the violent, always has to be blaming someone/thing else for their condition and actions.
Where do you ever see any of these people ever say "It was my fault" ?
GREAT writer! SO glad you've given him a nod, and I hope other FReepers check him out. You feel smarter just reading about his reports from the front, where he was a practicing doctor in London, if memory serves.
"Where do you ever see any of these people ever say "It was my fault" ?"
Well, not in the first person singular. But liberals are always going about saying, "It was our fault."
Recall Clinton on Rwanda, WW II Japanese internments, slavery, etc., for example. Usually these vacuous apologies are made merely to distinguish the speaker from his countrymen.