Because almost all foods contain a certain amount of sugar, even like salad and mashed potatoes, so by injecting insulin before eating, they prevent themselves from having a, well, I don't actually know the term for when a diabetic is overloading on sugar, but basically to prevent themselves from dying. More.
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.