So was everyone in the community who knew the family. Because she had been hopsitalized for mental illness, there were many people involved with this case: doctors, social workers, family members, her husband---all were no doubt familiar with her variable condition. Yet none suspected she would kill her children. Only after she did so, did the Monday morning quarterbacks come out of the woodwork.
Hindsight is so clear. My own attempt at after-the-fact pronnouncements is that she did this to exact a sick revenge against her husband. But, of course, none of us will ever really know for sure.
Yes, I wish I knew the winning (or losing) number before.