Why Are So Many on the Left Moral Scum?

Dennis Prager here details recent vicious attacks upon himself and his wife, and then offers an explanation of liberal-left scumbaggery:

First, truth is a not a left-wing value (though, of course, some individuals on the left have great integrity). If you don't know that, you cannot understand the left. Truth is a conservative value (though, of course, some individuals on the right lie). From the Bolsheviks to today's left-wing, lying is normal. Not one left-wing comment or article (except for the HuffingtonPost reference to the MIT report) even dealt with the issue of the truth of the claim that one out of every five female college students is sexually assaulted/raped, or the truth of the charge that our universities are a "culture of rape."

Second, mockery, indeed cruel mockery, is the norm on the left. I urge readers to visit any of the liberal websites cited and read the comments after the articles. No significant American group hates like the left does. If you differ with them -- from global warming, to race relations, to same-sex marriage, to the extent of rape on college campuses -- they will humiliate, defame, libel and try to economically crush you.

Addendum:  More liberal-left scumbaggery:  New York Times publishes Darren Wilson's Address. Liberals see politics as a form of warfare, and they will do anything to win.  "All's fair in love and war."  When will conservatives wise up to this and learn how to fight back?