[farts_mckensy]

Not proven ≠ Wrong

It's true, a direct link hasn't been proven, and I was debating even mentioning that. Obviously that specific tendency alone isn't indicative of a homicidal individual. But I would speculate that it has something to do with dysfunction/dysregulation of the autonomic nervous system.

[svnt]

Yes, but that is the absence of evidence, commonly called on when the science hasn't been done.

If a theory/hypothesis remains not proven once the science has been repeatedly done in numerous attempts to prove it, very often it does mean it is wrong.

[farts_mckensy]

A mere two studies are cited in the Wikipedia quote you supplied as evidence of the supposed wrongness of the hypothesis.

[svnt]

Wikipedia is not often referenced in literature reviews as an exhaustive source of relevant studies.