There's a difference between consensual sex with post pubescent girls - which is what Bowie and Peel did - and the rape of pre pubescent children, which is what Saville did. Both are pretty despicable, but I think there's an obvious qualitative difference and I also think, rightly or wrongly, that Saville's actions were worse. To use the parlance of this thread, I think Saville was a nonce, while I think Bowie and Peel engaged in some awful behaviour that maybe wouldn't be countenanced and hopefully would lead to prosecution now.