I know it's an old chestnut that somebody with no discernible talent or charm must have something big on their bosses/important people to have their position, but it just seems so apt for Savile.
What did he actually excel in? He had no charisma, no on-screen rapport with children/other guests, was a very pedestrian DJ, I suppose he was probably a good marathon runner and prolific cigar-smoker, but how did he achieve such stardom?
Just to take the example of Jim'll Fix It, the format was developed - with it being extremely obvious that a lot of children would pass through the studio - and of all the talented, non-creepy presenters they could have chosen, somebody looked at him and genuinely believed him to be the best person for the job.
Just off the top of my head, how much better would somebody like, say, Keith Chegwin, Johnny Ball, Sarah Kennedy or Tom O'Connor have been at the job? In fact, they could have chosen pretty much ANY celebrity of the time and they would have done a much, much better job than he did; but no, they actively chose to give it to the creepy, bored-sounding man whom everybody knew should never be allowed near children.