Well, should we be taking down Alqueda websites? There seems to be an implicit assumption in this whole philosophy that if you prevent people from speaking their socially-backward beliefs (online, in person, in websites, in writing) then you'll somehow prevent negative behaviors.

I'm not convinced that's the case. I think progress requires a more nuanced approach than "punish the baddy," but an examination into the psychology and a discourse that shows you understand the frustrations that are being channeled into blind-rage.