Often torrents on Pirate Bay are everywhere else as well. Those sites don't have the word "pirate" in them. If the author doesn't upload their torrent to other sites, someone else does. Usually any torrent you decide to download doesn't just share files from Pirate Bay users, but any user currently online, regardless of where they got the torrent file from.
Saying Pirate Bay is responsible is like saying the whole internet is responsible. There is nothing special Pirate Bay does that everyone else doesn't do. They were just attacked first.
The only thing Google doesn't do is provide the torrent file itself (not the actual file people are trying to download). Since it's a fact hosting torrent files isn't illegal, that does make Google just as responsible as The Pirate Bay. Having said that, I think Google is an excellent resource and would never want their search engine to leave the internet, but Pirate Bay and any other file sharing site is disposable and makes little difference. Google can always find others!
I've said it before and I'll say it again. Because torrents can be completely legal if proper copyright precautions are taken, you can't say Bit Torrent should be illegal. And yes, the economy will suffer because artists do rely on this technology. I personally know an artist who's created many albums, he's now trying to get back into the business. I told him creating his own torrents will make him more fans then any other way. I'd hate to see that disappear just because the main music/video sellers don't want to share profit with smaller organizations. Could be as bad as Time Warner clogging digital online purchases by putting a cap on downloads (which they've removed thankfully).