Yes, many things, many reasons. And let's not forget the case of the person who, through whatever causes, has been born with a sadism in his soul - a sadism in his mind. He enjoys - get's a thrill! - from seeing another person in pain, and, so, for the purposes of self pleasure [if you will] sets out to cause hurt to others. This is an evil if the recipient of said pain is unconsenting[!]