Again I must point out, that unless the admin is notified, then IMO its not illegal. If that were true, then google would be illegal, as they contain links to copyrighted material. They just take it down when they get notified about it. They don't go around looking for stuff to remove on their own, so why should it be any different for torrent sites, they are also only indexing links.
Now I understand that most if not all torrent sites do not provide a way to be contacted about such links, but if they did....?
This is all just a curious subject for me, I'm not trying to be difficult or prove I'm right. I just like a good debate