I've been reading Bernard Goldberg's book, Arrogance, and I read his previous book, Bias, and it's absolutely clear they don't realize it because they live in a bubble of their own making. As Goldberg points out, an actual conspiracy would be easier to change.
That would make sense. I know not every Left leaning person seeks to do evil...and yet that is the result of the vast majority of their goals. If it's just ignorance mired in arrogance it would make sense why they don't see their hypocrisies.