Why do People Ridicule Others on Yahoo Answers (Especially on Pokemon)?

Why do trolls even care what we ask and ridicule us? If someone asks any question that's not Pokemon related, they leave it alone. If Pokemon's mentioned, then they troll. WTH? Don't they have a life or something? I was pretty sure last time I checked Yahoo Answers was supposed to be helpful. They should mind their own business. Now a few questions for you guys: Do you hate trolls too (=D)? Are you a troll? Why do you think trolls don't mind their own business?