"I think the Pirate Bay are wrong to distribute music & film"
-- TPB don't distribute anything. You don't download anything from TPB except a pointer. The porn, music, Linux ISOs, etc, are on other users' PCs.
This is not a trivial distinction. It's the same thing that protects Google and Yahoo from prosecution for things you find via their sites.
"Further, as TPB are breaking the law"
-- If they were "breaking the law" they could be prosecuted and shut down. Many attempts to do this have failed to prove they are in fact "breaking the law.
Blocking the site rather than having it taken down is an admission of this.