Does his status provide a motive for a false accusation? Sure, but that is different from evidence.
For instance, a mammography doesn't give you cancer. But it can detect one, and thus give you evidence that you had cancer in the first place.
Fame doesn't affect all accusations the same way. I believe the probability of false accusations raise faster with fame than the probability of true accusation (which is mostly dependent on actual guilt).
There's even the possibility that the probability of true accusations lowers as fame raises, leaving more room for the false ones.
