Some of us did tell and were punished for it with more abuse and more isolation. Some of us had no one to trust to tell and in my case when I did eventually come to know someone who cared I had been abused for so long and was so confused as well as being still subject to the abuse between contact with this person I was beaten down by the lack of action to help me. No one seemed to be adult enough or strong enough to stand up and say this shit has got to stop or failing that just simply pick me up and walk away with me to protect me.
There is no secret door for kids in the same situation, every alleged secret door lead only to more abuse and reinforcement of the idea that no one cares, even the behavior of those who said they cared.
The fact is a lot of us who were from broken families had no one and it was customary to absue that fact even by those considered "normal" and placed in charge of us in the institutions we ended up in.
As Mark Twain once quipped, history may not repeat itself, but it does rhyme.