The argument usually advanced is that in killing women you are killing the breeders, whereas men can be more easily spared. But this is a fallacy based on the notion that human beings can be bred like animals. The idea behind it is that since one man is capable of fertilizing a very large number of women, just as a prize ram fertilizes thousands of ewes, the loss of male lives is comparatively unimportant. Human beings, however, are not cattle. When the slaughter caused by war leaves a surplus of women, the enormous majority of those women bear no children.
Male lives are very nearly as important, biologically, as female ones.
Most of them will have been under thirty. If all those young men had had only one child each whe should now have en extra 750,000 people round about the age of twenty. France, which lost much more heavily, never recovered from the slaughter of the last war, and it is doubtful whether Britain has fully recovered, either. We can't yet calculate the casualties of the present war, but the last one killed between ten and twenty million young men. Had it been conducted, as the next one will perhaps be, with flying bombs, rockets and other long-range weapons which kill old and young, healthy and unhealthy, male and female impartially, it would probably have damaged European civilization somewhat less than it did.