Why do you believe him apart from a willingness to believe in conspiracies?
The evidence would have been the dead bodies of children, grieving parents of the children, other people who noticed a schoolchild had vanished from class, anyone else who had noticed the child being killed on a street in broad daylight. None of this exists and a lot of evidence exists that it didn't happen.
Anyone can accuse Jimmy Saville now, you don't have to be 'right' about that, it's common knowledge. He's picked together a collection of famous people who either are dead and known to have been offenders, or have convictions for something - generally not abuse, or just people he thought he'd pick out of thin air and tie together.
And what do we have evidence of - him being a paedophile himself.
Hmm, well I think I know who I do believe.