> I mean, any man sufficiently ill-willed can certainly do all that today. I am unbothered, to say the least; I have better things to do with my limited time.

Uh, no? In fact humans do not currently have a way of causing human extinction (nukes wouldn't do it with current stockpiles). That would require scientific advancements which we have yet to make, and most possible routes seem pretty non-trivial... except, unfortunately, AI.