This is the same as saying gun manufactures have liability in any murder committed with their product which many argue, they have not done enough to prevent the wrong people from getting firearms. But it is the wrong analogy. In sites like youtube, it is more like a property owner that rents a building and is aware of his tenants performing illegal activity on a regular basis. Which depending on the crimes and the amount of knowledge could make the property owner liable or even an accessory. But all of this leads to the same arguments and worthless discussion about semantics. The correct discussion is what value we place on media as a society. The easiest way to solve this is to stop supporting artists on major labels. Advances in technology have lowered the barrier to entry in recorded music to a widely attainable level. Artists trade the rights to their music to labels for the label's marketing and distribution. Now days, interesting things go viral with little to no marketing effort and there is no argument that the labels are decades behind in their distribution channels. Even if you wan to avoid iTunes or other services, It is relatively easy for a moderately tech savvy individual to push a digital album to S3 or the likes, link to it from a static site and serve millions of downloads. Could even get fancy and deploy a web store template from godaddy for taking payments. Yeah, it might take some learning but so does negotiating a 100 page recording contract... ask Aerosmith.

We can't keep bashing labels for defending/protecting their aging distribution channels. You can't blame a dog for acting like a dog. We can create truly disruptive new distribution channels with better terms for artists and go head to head with the labels.