Wrong, Dad. There are several people at fault here. Firstly, the babysitter, who was stupid enough to let small children go near four dogs in the first place. And secondly - you, the parents who allowed their children to be looked after by someone who had four dogs roaming their house.
I am sick to death of these things being brushed aside as a "tragic accident". Accident implies that it was not preventable, when in fact this was 100% preventable. I have zero sympathy for any of the adults in charge of this child's care - I hope they wake up screaming and crying every night for the rest of their lives. It's the very least they deserve.
I reserve all my sympathy for that poor little girl who died in unimaginable terror and pain.