Well the mighty lion is known as the king of the jungle and tends to eat human flesh though its the same for the polar bear. A lion can be tamed easily unlike a polar bear which takes expert hands. There are more cases of deaths by polar bears in a controlled facility than of lions.
Wild lions are of coarse more ferocious than wild polar bears and have taken more lives. So I would say there equal.
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.