I would wager some of it is from unconscious bias since he is already positioned as a criminal before you even even see the photograph. Your brain wants to tel

I would wager some of it is from unconscious bias since he is already positioned as a criminal before you even even see the photograph. Your brain wants to tell itself that it can identify such criminals so it picks up on what it can. The rest is very much "oh, this person is now known as a criminal, let me find the most sinister looking photo of them possible."