What's Happening on YouTube?

I am a YouTube addict. I even sometimes use as a search engine; it is full of a wide range of useful enriching videos. Things I've never thought I will watch. I see different people from different places broadcasting themselves and it just widens your span of knowledge and acceptance of other cultures IF you use it the right way.

There is something on YouTube that really bothers me. YouTube comments became a front for wars between people and cultures. You can simply find a song and instead of finding comments about how beautiful or ugly the song is you find swears, insults and derogatory comments on the singer's race, religion or country.

Fanatics are everywhere, but with opening more and more legal channels to them they are increasing. I know that a person who swears at others or insult behind his computer is a coward but behind this computer is a real person holding dangerous thoughts. It is very rare that you find moderate comments on YouTube and I wonder why? Why humans when they have the chance to express their opinion freely the first thing they do is insulting each other? I do not have an answer but I urge you to think about it. What should we do to stop the wars over the internet?