People lie to themselves – anything from ‘I’m not harming anyone’ upwards. And once they’ve successfully lied to themselves it’s a lot easier to lie to everyone else. And they can totally compartmentalise their lives.
I’ve never spotted anyone who messed with kids or was criminal in that way. But I lived with someone who was like two people. He had a level of self-delusion and self-justification that was difficult to comprehend. He would outright deny that he’d done stuff to me to the extent I even questioned myself. And on the outside he was charming and charismatic, kind and generous to everyone he knew.
It took me absolutely ages to come to the conclusion that he lived in a state of denial, he wouldn’t own the nasty side at all. He was basically a contradiction. But now stories of people who live ‘double lives’ don’t surprise me.