That wasn't the point of the answer. The point is "How well do you really know someone?". You really don't. Many people live with partners who end up killing them, although they thought they trusted them.

Besides, "Bayes law" is not on your side on this one, it's well-known that "regular people" are over-represented in homicide, and "autistic people" or even "schizophrenic people" are under-represented and are mostly harmless