Although being anonymous can certainly bring out the worst in people, it is also necessary to provide an outlet for people when being identified would carry it's own set of problems. On the web, you are not anonymous -- even though most people feel or act like they are. If you want more anonymity, you should use a web proxy list for occasional anonymity, or else an anonymous proxy network (Tor).
Why do people need anonymity? Freedom to do what is otherwise restricted, or freedom from reprisal. quote: "(In my country) I can't see BBC, Wikipedia, or Blogspot without proxies."