Just because that there ARE anonymous people posting stupid shit, doesn't mean all people do that when anonymous. In fact, show me a nice invention that wasn't made by a freedom loving person. No bigger freedom than anonymity! We need it. How can you express yourself without being silenced right from the start without it? How can you spread disruptive ideas when people instanly have a name to point fingers to?
An idea should be separate from a person, to really be neutral. If there is a person behind it, people start investigating the person, rather than checking the idea in depth.