I don't think half the country was duped by Savile at all - unless you mean those who were children at the time and unable yet to recognise the signs of a predator.
Loads of parents were wise to him and protected their kids from getting near to him. I wonder how many sincerely-written letters from kids asking Jim to fix it for them to meet him and do something fun mysteriously never made it to the postbox?
Terry Wogan and the producers of the Children In Need programme knew all about him - and fiercely stood in his way when he wanted to be involved. Esther Rantzen knew. John Lydon knew. Most of the BBC knew - and it was almost treated as a running 'joke'.
The man hid who he was in plain sight. Even if you didn't know exactly how bad he was, he was very obviously 'concerning' enough that you wouldn't want to get close to and be associated with him. Charles trusted him (lifelong bachelor as he was) as a 'marriage advisor'. Thatcher invited him to her house for Christmas every year for over a decade.
Yet we are to believe that not one of Charles' many experienced advisors and protection team ever realised that he might be somebody to recommend Charles distance himself from? One of the most influential, powerful and famous people in the world - and none of them even as on the pulse regarding clear potential threats to their employer as Johnny Rotten was? Really?!
I agree with others who suggest that Andrew may be being protected because of what he knows and the very prominent people he could destroy if he actually faced a proper trial and justice and chose to take them down with him.