To error is human and everyone has made mistakes they would never tell others I am sure. I am sure he is suffering the humiliation and guilt of his daughters injuries couple with that nagging "what if?"
Lord only know what his wife is doing to make it worse on him.
But this needs to be a lesson to all of us. I have suffered the scorn of those who think I am paranoid about safety and I worry too much, for this I say I rest my case....
My heart goes out to him, his daughter and family and I hope the little one does not suffer any lasting injuries, and neither does dad and the family over this... Sometimes these events even though tragic in nature brings strength to a family, when they realize what they could have lost.