And to be clear, what youtube is doing is putting up a notice saying not to post copyrighted material, while taking no effective steps to keep it from happening.
You're wrong. YouTube deletes several thousands of video clips every day, that do not comply with the rules. How are they to know whether say a clip from The IT Crowd was uploaded by a copyright holder or not? Even though you have to create an account to upload stuff, it's still fairly anonymous. Just because someone is called "UniversalMusicGroup" doesn't nessecarilly mean they represent the company. Actually DanMan a TV company is responsible for what happens on live TV.
Really? So who was held responsible for Christine Chubbuck's suicide?