Foot fetish. DNA screwup or criminal intent?

This man was really getting out of hand. He left the downtown area and starting his foot fetish, at the nearby shopping malls. He would approach a female from behind and asked her what size shoe she wore and could he see and touch her toes. Some women went along with his routine and other screamed and ran.

Question: so what gives with a person with a foot fetish? Is it in their DNA or is it just criminal intent.

BTW, he was apprehend.