Nasty people of the world

wat sort of person would do nasty stuff?

this person went on my friends forum (thriving with over 1000 posts and nearly 150 members) and became a good poster on the forum. He was then made a mod, and decided to delete nearly ALL of the threads. How could someone do that? wat brings someone to that?

the forum is www.twingraphics.tk (offline at time of typing)