The alleged victim in this scenario may not want to bring it to prosecutors for a number of reasons but, felt that this man needed to be removed from the sport over it. Sexual assault victims sometimes do not go to the authorities because of:
Fear
Intimidation
Loss of income/job/contract in workplace situations (why many workplace sexual harassers never come to justice)
Abuser is family
"He said / She said" (if no witnesses present, many date rapists get off this way - "It was consensual.")
Omerta (violating a code of silence that can have long term complications such as being harmed physically or financially)
Embarrassment
Shock/Disbelief
It is well known that several NOP athletes, both male and female, saw Salazar as more than a coach. To them, he was also a surrogate parent and a spiritual guru. It is also reported that beyond giving them workouts, he was also providing supplements via strange methods, experimenting with grey area substances and telling them very little about those substances, convincing them to see select doctors about conditions only he observed, testing their loyalties. and even telling them where and when to go to church. Is that where it ended?
History is sadly littered with father figures, pastors, and other svengalis that groom and take advantage of naive, young, and very impressionable people. Could this be another example?