Lennie just had to die and George knew that. It wasn't necessarily his fault. If Lennie was to die then they would just have to keep running away and hoping for their ranch but it would have never happened.
Lennie was like Candy's dog, he just needed to be put out of his misery and candy and George needed a new start. Plus, Curley would have killed him in a more violent way. Thus, George didn't want Lennie to be killed but, he thought it was the only way out for Lennie.
That's why he was telling him that they were going to have the ranch and tend the rabbits, for he could have a happy death. Then instead a horrifying death.
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.