OK, but just because a serial murdered can be charming, doesn't mean that every charming person in a serial murderer. It is true, I can't deduce anything with certainty from my personal and public correspondence, or the messages I see him send to others. But as opposed to the serial murderer, the issue here is the way he communicates and behaves.

I guess you could try this out empirically, by creating a throwaway Email address and sending him a dry, technical question under a female name, and see how he responds.