A photographer friend of mine has been doing a long term project of photographing a local park over many years (twenty so far). About ten years ago you suddenly notice that ther are no kids in the shots any more.
I asked him and he told me of a woman in the distance that shouted 'look at that pedofile over there taking kiddy pictures'
The people in question hardly registered on the photo.
After that he made sure there were no one in the shots.
Sick people need to be caught but when does it become to excess?
It's like the searches getting on a plane. If you want to be that sure then strip search everyone! Not going to happen!!!