Earlier quoted context omitted.
In practice it just doesn't work very well sometimes. I think it's better to risk letting more child abusers off the hook, than potentially ruining the lives of decent parents like these.
If it's hurt adults or let children be hurt, I don't know if I can agree with you. Children are much more powerless than most adults, and the strong should always stick up for the weak.
It really comes down to a simple question: who owns your children, you or the state? As of late, it's the latter.