Fair enough, we can differ on whether the RIAA is on a general hunt to track down and sue consumers; if you do some research, I think the facts there *are* objectively pretty dismal.
Dismissing Patry's blog as "just another blog" or saying you don't lend any credence to it because its on the internet does not do you credit, however. Patry isn't just some dude with wordpress. His resume is on the website and easily authenticated. FBOW, he is a leading policy scholar in the copyright field--"Senior Copyright Counsel, Google Inc. Former copyright counsel to the U.S. House of Representatives, Committee on the Judiciary; Policy Planning Advisor to the Register of Copyrights; Law Professor Georgetown Law Center (adjunct), Benjamin N. Cardozo School of Law (full-time faculty member, founding director L.L.M in Intellectual Property program), author of numerous treatises and articles (including one on fair use with Judge Richard Posner), including a forthcoming multi-volume treatise on copyright." It's not exactly a punter's resume, even though Posner isn't my favorite academic.
Besides, I think we may be in violent agreement, except for our respective views on the RIAA. I was just trying to answer your question on the "proof" issue by noting that, as a practical matter, the legal process is a very expensive way to discern truth. So expensive, in fact, that the actual truth of the matter may be irrelevant when matching an experienced and well funded litigant against a consumer who is a neophyte to the court system.