wouldbemedic, lots of people ignore social convention, it's no indication of an interest in or ability to sexually abuse children. Many child abusers are outwardly respectable, if he's not a paedophile then he's not going to abuse children in the first place.
With Saville (and others), once one or two allegations became public, the floodgates opened. There has never been any suggestion that Allen has abused any other child. Somebody would have come forward by now. They haven't.
I find it hard to believe that a man is going to become a first time child abuser at sixty.
The investigators believed the child was coached and manipulated by her mother, her nanny was pressured to lie and felt the need to leave her job because of the pressure, her brother claims that his mother is crazy, controlling, manipulative and bullied them into hating Allen, Allen passed a lie detector test at the time (which Mia refused to take).
It's not impossible but it's unlikely and it's wrong to condemn a man as a paedophile based on unproven, questionable allegations.