Ok, So we know that recent experiments involving theories on parallel universes have lead to amazing discoveries on the quantum level. So, now we know that everytime the quantum universe is faced with a choice it divides itself so that it may take every choice. So, due to recent developments in time travel and so forth we know that what one parallel universe does indirectly alters another. So, what we do alters our parallel selfs and vise versa. So if that is true, we are predestined, WW2 might just be the indirect result of a parallel decision. This is just my theory take it how you might.