Tom—In case you’ve missed it, I’ve added a P.S. to my previous post to Margaret. I’m inclined to agree that regarding gender identity, it’s unlikely that there’s much “choice,” or free will involved, that it’s something that’s probably hard wired at a subcortical level.

A mass murderer, however, obviously “chooses” to be a mass murderer (except possibly in cases where the mass murderer is truly insane, or perhaps is a “child”). As best I can tell, there aren’t many “sane” “adults” that would argue, as you seem to, that a mass murderer is somehow not “morally responsible” or that mass murderers are “just following their social instincts.”