We need to get the government to respect our rights and the Constitution and we need to make it hard for the government to violate our rights. The two aspects go together. Much as one might like this just to be about convincing politicians and bureaucrats to do the right thing, making it harder for these politicians and bureaucrats to do the wrong thing needs to be part of the process. Oddly enough, I think the framers of the constitution understood this.

And Megaupload had the technical problem of a single point of failure. Peer-to-peer is more robust - it still can be shutdown too but it's still worthwhile to make things hard for would-be censors.