As Mccfluffy mentions, the abusers do shame their victims into silence, they can't say anything because they feel ashamed, perhaps dirty, let down, possibly suicidal, and frightened so much on how they would explain what happened, that they just try to block it out. That is all they can do, as they can't understand why them! They deserve compassion, understanding and help when they tell their story....and not ignorance or any sort of blame for what they did...... they did NOTHING wrong....
Whilst at high school, so I was about 14, we had a sports teacher who was trying it on with a couple boys in our class....like undressing WITH us in the changing rooms after football, as he was usually a referee or linesmen..massaging his bits in front of some boys, which was unnerving and frightening....some of us knew what he up too and we decided to report him to the Head of P.E, who was such a nice man, lived and breathed Sport, and been at the school for over 30 years..... he took it to the Headmaster......then all we know is that there had been allegations before and he managed to dodge them, but he had just started to groom a quieter lad in our team, but luckily only discussed meeting him outside school....he was sacked and never taught again..... not sure if arrested, know that the police were involved.... we were just glad never to see him again.