Earlier quoted context omitted.
On the other hand, and not that I'd like to be sued for placing links, if the link in my page is something like Avatar Movie Download , the argument that the page had the text of the Holy Bible in it last time I checked might not be very convincing. So I can see how someone might mull.
Have you ever used the Pirate Bay? The links there are actually magnet links (i.e. BitTorrent links) and they just look like random gibberish. What you get on the Pirate Bay is descriptions of these links. So it's more like: Avatar HD Trick is, that description may or may not actually be true. The content is submitted by PB users. The PB, AFAIK, doesn't actually vet this information. And, BTW, not all of the content…
Anyway, I crafted my link for comedic value rather than "realism", and then my point was that someone could put, on a web page in their own full control, a link that points to pirated copyrighted material beyond reasonable doubt. You talk about the difficulty of a site with user-submitted content to place limits on what that content can be, which is relevant if someone proposes draconian copyright enforcement measures, but it does not refute my point. As to PB having non-pirated content - sure, and the red light district probably has businesses that sell food, but PB is like my link example in that nobody would buy a claim that its main use isn't pirating copyrighted content.
Again - perhaps it's reasonable to have laws letting people get away with it because any alternative laws are worse (or we could have no copyright law, etc.) All I'm saying is, you don't have to be completely ignorant to say, hey, there are guys who don't only piss into the swimming pool but they do so standing on the springboard, and how about we discuss ways to stop them.
Also, and somewhat independently from the above, you mention in a sister comment that you're a filmmaker. That's interesting - I didn't know you were - and I guess I'm an aspiring filmmaker myself. But that is different from being dependent on the income from filmmaking. Someone trying to live off their own films is in a pretty tight spot right now because basically they compete against a near-infinite amount of de-facto free-as-in-beer content. You mention that Hollywood is alive and well but many in Hollywood disagree, it hurts them a lot - as to someone with a smaller budget, making a profit is unlikely. I don't know how matters could be better, though perhaps if it were illegal to sell/give up the authors' rights, and if we'd be forced to pay per view or some such, and the enforcement of it all was practical, things would be better. Or they might have been worse, I dunno...