If you haven't guessed by now I put a stop to anonymous posts on this forum the other day by changing the settings. Anonymous people seem to leave the most stupid and insulting posts.
In the past there have been some annoying trolls. I found that the benefits of being able to debate with sincere people, at least gave us a chance to expound on our beliefs and maybe bring some people around. The chance to do that outweighed the annoyance of trolls, at least for me.