For heaven's sake WowOoo, apart from anything else, the recent case of abuse of babies in nurseries was against women.
Young children believe that what adults in authority do is what should be done. Evidence shows that children stay quiet about serious abuse within a family because the idea that thier paents are doing something WONG or BAD is an even more scary thought than what is happening to them. They may not have the language to talk about what is happening, or they may be embarrassed. Or not yet know what is harful, if they are not suffering actual pain.
When I was at school, though older than this, we were flashed at from the bushes every day. No one EVER reported it because if you did, they called your parents and in front of your Mum, a police officer and the scary shool secreatary you had to answer questions such as 'did you see his penis?' 'was it erect?'. That was way more embarrassing to us than just seeing a bloke, laughing and walking on past. But telling adults can be a duanting thing for any child to contemplate.
But it is very chilling that this man got away with this for so long within a school.