What about the other charges, such as providing alcohol to a minor?
Did the evidence of those things also depend entirely on the credibility of the same witnesses? I didn't follow it closely enough to know.
I'd think though, that if you are going to find the kid unbelievable about any of it, you might find him unbelievable on all of it. Just a guess.
Honestly, I certainly don't believe that MJ is innocent. I think the guy is a pedophile. But we can't convict on probability. The jury had no choice but to return a "not guilty" verdict because the prosecution didn't prove the charges.