We've seen a lot of mug shots posted to FR, and invariably someone comments on the thug's "dead eyes". "soulless" "like a snake's", "sharklike"....That's how the eyes of career criminals come to look. I think that is likely what the photo viewers are picking up on...Something in the eye, or something that's NOT there.
Good observation.
IMO.. individually, to some degree or another,they have NO LOVE, RESPECT, or CIVILITY capacities within their soul.