Did you RTFA? It's more than just TPB. But since you asked...

... it's about free speech. TPB is not illegal, and it's not a source of piracy. It's a search engine. You think TPB's illegal, then so is Google, since you can use both for the same purpose.

Do you have the "guts" to pull the plug on Google? By your standard, it's just as illegal. They both point to .torrent files containing pirated material.