Ska, I do think you are very, very wrong on this and if i am to be totally candid it does make me wonder if you are being entirely forthcoming about your profession.
The mantra with child abuse is that if you think it, report it. That obviously isn't just sexual abuse and conceded, in your field it would apply more to concerns about abuse taking place within a familial setting.
However, and this is true of all crimes, not just child sexual abuse, so many people get away with it because of this mantra - that oh, there's no point, nothing actually happened, he was probably just lonely / liked kids / she reminded him of his granddaughter.
None of that is really the point. If we return to the land of facts, we KNOW that sexual abusers are more likely to take jobs where they have access to children. We KNOW that those in jail right now for some of the most horrific crimes the country has seen have barely had the surface scratched on what they 'actually did. And they are just the ones in jail. Thousands more have been touching and kissing little girls for years, occasionally perhaps a bit more, but managing to stay under the radar.
When someone reports someone, chances are the police can't really do anything. When ten people report something - if ten parents contacted the police and said "look, my children were playing on a slide last night and a man kept approaching them and asking them for hugs and kisses," it creates a picture they CAN do something with.
To put it another way, if a teacher reports that a child wrote a story where their step dad hit them, a neighbour reports hearing raised voices and crying, a family friend reports the child refusing to go home after a playdate, a football coach reports bruises - that, all put together, creates an obvious jigsaw.
Grooming has become a but of a buzz word lately. It's really the frog in hot water analogy. A groomer very slowly and carefully pushes his boundaries when it's one individual, but you can groom a child to accept sexual coercion in small ways starting from a young age, starting with demanding kisses in return for favours 