Aldrich threatened Beach and John Doe with their entire careers, and everyone - from their teammates who insulted them with slurs, to the coaches and front office that tried to bury it - was against them and on Aldrich's side.
If I went and punched my old boss when he screwed me over, I'd go to prison, have a criminal record, and nobody would be on my side - and I was a lot older than Kyle Beach and John Doe. They were basically kids. At that age, kids usually go to college, and their minds aren't fully formed yet until a bit later (25 years old, for clarification). There's shame, guilt, fear, all negative emotions that would prevent them from retaliating.
And then there's the whole power dynamic of a coach who would threaten to bury you in the minors if you didn't do what he wanted you to do. In Aldrich's case, if Beach and Doe didn't accept his advances, he'd have their careers derailed (which eventually happened). And worse still, everyone was on Aldrich's side.