Are people who exert inhumanity on other people, like Putin, Death DeSantis, etc., able to acknowledge to themselves their inhumanity?

No. DeSantis thinks he's dealing wih cattle, not people. "Send them off to greener pastures." That's not inhumanity. That's what? Animal cruelty in his mind -- at most?

Hell no. They're proud of it. And so are many voters.