It's so prominent as to be almost universal in Leftists today, but what we are seeing is this: they begin with the premise that they are "one of the good guys".

You can see that that's a complete inversion of what we assume everyone is doing: collecting facts, applying moral principles, and evaluating whether they have done right or wrong.

Once one can accept that the consciousness of such people is truly different from what you previously assumed, you'll see that all their thought, speech, and action flows quite naturally from that.