I think his appearance in the annual showed complete disregard for human life. He got people killed showing off, and planned on worse, but didn't think a thing of it. He was quite willing to kill behind closed doors. He made it clear that he thought some people were just born superior (coming from "good bloodlines"). I can easily buy him doing something like this, using "well, they're inferior, not from good stock at all. Have I ever mentioned I'm related to Benjamin Franklin?" as justification.