You came here voluntarily, you joined PvP voluntarily, you bought the game AND got on the Internet voluntarily, you can leave voluntarily as well. Anonymity is a bitch, it really is. People don't worry about the consequences because nobody will ever know or care they existed. When you can't really get in "trouble" for your actions, people tend to do things they wouldn't normally do. I've been playing online MMOs and FPS for more than 10 years, this is just the nature of the Internet, as long as online play is available with a crouch button, it will always be the most used button in the game.