Their inability to see themselves for what they truly are and their typically anti-social but unconscious inner thoughts about how everyone thinks is part of why they are so convinced that others think exactly as they do.

Every evil twinge they have becomes what they expect from others, with no recognition that it is themselves, not others, who think that way . So they live dog eat dog lives convinced that others are bad and that they are victims who self-righteously attack others for things THEY think but don't recognize in themselves.

That's why they so often accuse others of what they think and do. They have zero recognition that they are and have done precisely what they are criticizing and don't see that everyone else can see it.

IOW, NO self-awareness on any conscious level. They have no shame simply because they are incapable of it due their inability to se their inner selves.