The last time he had left it up to the police, murderers walked free. The judicial system was completely messed up - they misstated facts, let suspects slip through their fingers, used community resolutions to deal with criminals, let law-breakers off etc. Someone had to take matters into their own hands, and Harry was more than willing to do so. Unlike her parents, Gwen tried her hardest to steer clear of illegal activity. Even though her parents weren't exactly law-abiding individuals (as a matter of fact, they were far from it) she would stop at nothing to protect them from the brutal and grimly inventive games of The Educator. Even if it meant she might end up in one of the savagery traps.