"Shame only slithers into these sorts of minds after they've been beaten and are facing the firing squad. Same as any other authoritarian."
I'm not convinced it ever makes it into their mind, the only remorse they show is for themselves when they get caught. Witness Trump playing the victim "the most persecuted" "rigged election" etc because he couldn't allow the possibility of his yet another failure to enter his consciousness.
If I were to muse over his mental state, I think he has serious daddy issues and has become so deranged with his multiple business failures that losing an election has driven him (more) insane