Half way through the Hadley Freeman article, and I've paused to do a bit of a brain dump/ask a question.
DS has always been very athletic and totally bouncy (think Tigger on speed), so I've spent a lot of time from when he was tiny finding active stuff to wear him out. When he was 2 I used to take him to a toddler gym club at the local (very successful) gymnastics club. Age 3 when it came time for him to move up a class, the next class up parents were not welcome - you were not allowed to stay, even to sit quietly at the side of the room. DS was really unhappy with this (no suggestion of anything untoward, just a natural 3 year old who didn't want to be left alone), so we quit the gym club.
But it strikes me that this sort of environment where children are expected to be left without parental supervision from a very early age is precisely the sort of environment where abuse can thrive (incidentally I am not saying this happened at the gym club DS went to - I had nothing to set my spidey senses off, nor have I heard any rumours - and it's a small town!)
So - is it normal? DS, now much older, now plays rugby and football, and parents are often around, particularly with rugby.