One thing that was mentioned during a documentary concerning JS was when it came to his contacts with the royal family, there is still a form of 'assumption of safety' between public figures and the authorities.
The public figure - in this case JS - has passed through the 'filters' of local civic dignitaries, charity heads, hospital administrators and so on; each assuming that if so-and-so can vouch for the person then they 'must've been good to go'. It's a form of bias used by conmen and frauds - a random bloke in a white coat wandering around a hospital, who looks confident in his being there, must've been checked by someone, eh?
"Well, he's been in the public attention and a subject of several newspaper examinations, then they must be okay, eh? The investigative journalists and coppers would have found anything dodgy by now. Their life must be an open book, yes?"
When it comes to celebrity - public acclaim - then the royal 'firm' are suckers when it comes to old-fashioned thinking: Politically acceptable, no (obvious) criminal record, popular with the hoi polloi and so on.
So ...
We have a popular public figure, accredited by highly-placed officials (most of which aren't 'complicit' but equally reliant on a 'good word' i.e. "Did lower officials flag him up as a wrong 'un? No?") A waterfall of acceptance, if you will.
And the more accepted into the right circles, the higher you can climb, because the assumption is that 'lower level' checks have been made ... all the way back to when the scrote 'fixed' local coppers to say "Y'know Jimmy? A bit dodgy but okay at heart!" In this, JS was incredibly canny and had foresight; he knew how people thought and so set his 'protection' into place. As he got more popular, more influential, he built higher levels of protection. Anyone below him had no chance to complain or raise concerns - "Yeah, you may've seen him grope that kiddie, but who are you going to tell? The coppers? The press? The company?"
Even at his death, as a scraggy old man, his 'walls' of protection were in place. His own body let him down. No one else. And that, I imagine, is what is galling to his victims.