If you don't do something to stop an adult from abusing children, when you have full knowledge of it? You're a coward.
When you read the findings of fact by the grand jury investigation against former Penn State coach Gerald Sandusky, you see a pattern: Again and again and again, adults caught the guy sexually forcing himself upon young boys, and they did nothing. In at least two of the instances listed, adult men actually personally observed the retired coach engaged in sexual assaults of a prepubescent or adolescent boy, and they walked away. I wonder how they felt later about doing nothing to interrupt the activity?
Some called his organization. Some talked it over with their own co-workers. Some talked to the university (where some of the actions took place). The first case reported was from back in 1994.
Sandusky had started a program called The Second Mile, which took at-risk kids in. He had a lot of access to kids of that age. No one knows how many children he victimized over the years.
If you find out that someone is being hurt, and you do nothing to stop it, then* you're a coward.
Be better than that, please.
*regardless of the fact that failure to report the abuse is in itself a violation of the law...