Read the account in the bible it explains it all. To paraphrase God looked on the world and saw that it was so corrupt that He was sick in His heart that He had made man and resolved to destroy all His creation but Noah and his family found favour in the sight of God and were saved. Remember also the concept of original sin when talking about babies.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.