Simply? You lose, most of the time, when you "come forward". There is no parade, there are no articles in the New Yorker about your bravery, you just lose your livelihood, your dreams, and sometimes your life.
It's a sad, often poorly understood reality about whistle blowing, given the heavy survivorship involved. For every success story you hear, there are dozens you don't hear about, because nobody believed them, they were successfully demonized, or because it wasn't "big" enough to really, ultimately matter to American society in a way that could effect change.
That's why it's so impressive when people to come forward anyway, knowing this. It's far from "risk free" to come forward, and usually it's a gigantic negative experience, sometimes rivaling the original abuse itself in negative impact on your life. It's one thing to have the worst day of your life happen, now imagine having to relive it publicly, forever.