Viacom v. Youtube

It seems that, in the viacom v. Youtube case, we can have some viewpoint similar to the Sony case. One of reasons that the court held that Sony's betamax did not infringe copyrights of many producers, is that it had substantially non-infringing use. Similarly, main purpose of Youtube is to guarantee users to post and show their own opinions and expression without any restrictions. The objective of Youtube is not to freely share copyrighted works. Before Youtube, it was hard for citizens to express their opinions to the public unless they obtained any kind of support of a broadcasting station. However, thanks to Youtube, anyone can create and post video clips to show their opinions. They don't need the broadcasting station's support or help any more. Of course, there may be some copyright infringing contents in Youtube. However, Youtube is properly handling this issue by immediately taking them down. It seems that Youtube should win in this lawsuit because it is closely related to the freedom of speech.