I’m not sure they’re irrelevant. They were written by folks who were only twenty years removed from a world war (some of them actually fought in) and a society that sometimes bought into that stuff. So, for them, it was probably more personal.
Also, given that there had already been two world wars, given the smaller but still major wars (by any other name) that had been pretty constant since the second world war, especially in Korea and Vietnam, and given crises of the Cold War that had threatened all-out war, such as the one involving Cuba, it was reasonable to believe that another large-scale war could well occur twenty years down the road.

