Valkyrie's main purpose is not to kill things, but to protect you from the danger surrounding you. Although Valkyrie has lots of life (it gets boosted every difficulty level), it doesn't do enough damage even in single player. Moreover, the damage she deals is not constant as the base damage of her weapon is changed every time she is summoned (computer generates random equipment for her).
Therefore, it is recommended to put only one point as it is an extremely useful meatshield and can be re-cast again and again. 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.