It seems to me where Jimmy Saville was a national icon and was prepared to aggressively defend his ways, this is very similar to Robert Maxwell, who was always prepared to sue for liable anybody that he felt had blackened his name, true or not, and that is why on cost grounds the media kept away from him, so he could get on with his financial crimes, which after his suicide, two of his sons went to jail for.
I also think that it also has to considered in the context of the time, when in the 1950's, 60's and 70's there was a prevalent attitude that the girl was probably a groupie and asking for it. There is still a degree of this today when a girl makes a complaint after being passed around half the team of a Premiership club.
I know several musicians who toured extensively, when I've asked them about life on the road their replies have been booze, substances, sex, sex and more sex, where girls would be only to keen to go to a bands dressing room and entertain the band members after a gig and then go back to their hotel. The difference was they were women and with Jimmy Saville, Gary Glitter etc., the allegations are coming from women who were children at the time, many of them vulnerable.