If they are old enough and give consent, he's really only being a naughty boy, but not a criminal. If you have never been naughty before, you are either boring or lying.
It sounds like Silverboy has never actually done anything wrong, but some people like to twist a story or two.
The only wrong thing that Silverboy and his backers did was to deny things that were said. I am not worried if he cuts himself a slice of student now and then.
To be honest, calling someone a nonce seems to be the standard go to insult for anybody wishing to discredit a teacher and I struggle to take such accusations on forums seriously. It sounds like Silverboy has never actually done anything wrong, but some people like to twist a story or two.
A lot of the holier than thou people are probably hiding secrets themselves anyway as others have said.