Whether we prove or disprove something that may or may not have happened isn't really the point, I think. Personally, I don't know what really happened at Roswell. I don't even have a guess beyond "something". Then again, that isn't really the point, either.
I feel that we want there to have been aliens found on Earth, we almost need it... The question "Are we alone?" needs to be answered, and it is those three simple words that have put men into space and on the moon, allowed us to peer into the unknown, and sparked the creative imaginations of people like Roddenberry, Asimov, Clarke, Bradbury, and Niven (to name but a few) and alowed us a glimpse of what might be out there.
Three words make it so people want there to have been something alien found somewhere in the world, almost to the point of reaching religious fanatacism. Yet, believers in UFOs and believers in <insert applicable religious icon here> share one thing in common: faith.
Did aliens land at Roswell? Maybe. Are we alone? Again, maybe. Be an aweful waste of space if we were. Ultimately, I believe that we are not alone, and that we have been visited by "guests" a one point, at least. I don't need documents or rumors or anything else except what i already have. Faith.
Faith manages.