A keystone of a rabid leftist is its ability to be completely wrong time after time and yet still think that it is going to be right.
Normal and civilized people make mistakes but then consider those mistakes in future actions. This ability to learn from experience is absent in today's modern asshole leftist. These people believe that 1+1=POTATO and will hold on like a pit bull, no offense to pit bulls....because a pit bull is far more smarter, useful, and adaptive.
Bottom line, the leftists of today would have been culled a mere fifty years ago.