My theory on that is that a mother nurses her child, in which the milk comes from the mother's breasts, and common since told people that since cows can produce milk for their young just as humans but humans don't have to create life to drink it from a cow, and thought they ought to just get the milk from the cow.
Drinking milk is for sure not the strangest thing human beings started doing.
I believe the first ever human beings followed what mammals do.
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.