Why are clearly offensive people allowed to post on Yahoo Answers?

This should be a place of intellect where people share their experiences. Too often, I see racism, ism, phobic, etc. statements on here laced with profanity. I could name names if Yahoo asked but it is readily apparent to anyone who reads these things... Is anyone monitoring this environment? This should not be a place that promotes ignorance. It should be a place of expression that brings people together. Do you agree? Am I the only one who notices that certain parties on here are apparently not being blocked? Why is there not profanity filters on this website?