We could say we want the Web to reflect a vision of the world where everything is done democratically. To do that, we get computers to talk with each other in such a way as to promote that ideal.
There are millions of people who consume music illegally every month. Just getting them into a legal service will make the music industry way bigger than it's ever been before.
I agree that it is not just the extremists who harbor bad thoughts or engage in bad acts, but they are usually the source of the polarization and try to keep education and communication of the main stream from moving forward.

