Kissinger is Kakistos in Buffy, "an ancient vampire, so old he had developed cloven hooves and was incapable of assuming human face."
Feasting on the blood of millions keeps him alive. A friend and I were talking about what the proper abolitionist punishment for him might be: +

Put him in a dreary ranch house in a dreary suburb, and make him do his own groceries and cooking. On a stipend of $765.83 every month.+

Oh, and, of course: make him have to confront at least some portions of the millions whose lives he ruined directly or indirectly.
May not do him any good outwardly, but that process of confronting the terrors you created needs to be part of the process with him.