He felt the same thing the families of the victims felt. You can think if someone kills another person, they deserve to die. Timothy obviously thinks the same thing but in the end he won. It was a game of revenge. When you think that, The only thing that seperates him from you is how passionate you are about your beliefs.
ANY belief is better than NO belief.
Compare apathy to love or hate. Indifference changes nothing. Timothy's not fuckt up. He's no more of a monster than you or me. Because he's better than most people.