YL, it is men who play this game almost exclusively.
Don't try to make much sense of men. That is an even more hopeless cause than men trying to make sense of women
.
The whole WWII setting is almost irrelevant. How many people were killed? How many soldiers were killed? They don't come to the fore, in human perception. In a game the damages and losses don't count.
And as long as the game remains a game, there is not much to worry about. However, and this seems to happen, when the distinction between game world and reality fades, these games can be dangerous.