Why does WikiAnswers have inappropriate answers?

Inapropriate answers are given by users who just want to mess up the site and ruin WikiAnswer's reputation. That is why Vandal Patrol and Supervisors are always on the look out to eliminate these vandals, or "perpetrators". It's just because users think it is fun to write down inappropriate content, and Supervisors and Vandal Patrol Units are always on the look out. Since WikiAnswers is a wiki, where anyone can have imput, people think it is funny to mess up answers, when it is not.