The action of this woman who hung her children was evil.
Perhaps there was some postpartum depression involved, perhaps there was domestic violence. But don't brush past the fact that we should feel moral outrage that such a thing should happen and that a person would do it.
I do not pretend to understand what happened. I am not trying to apportion fault. But I hope that as we learn what happened, we do not lose our sense of evil.
We must admit the existence of evil if we admit the existence of good.