I knew a few people from the world of 60s 70s gangsterland & they knew all about Saville, who was himself not short of aquaintences, from that particular fraternity, & when they told me about him, guess what ? I thought they were winding me up. I believed some of the equally horrendous but non paedophile stories they told me about him, but not the bit about the kids, I thought they were making that up. So I've actually had the same reaction of disbelief at the time.
Obviously that changed when I thought about it, but stil, I can see how these fuckers can sneak under the radar. Now of course you realise how many there are, clergy, royalty, politicians, & of course the arts & sport.