WWIII would affect YOU YOU DOLT! Even if not directly it would affect your life in big ways! WWII had the peaceful USA homefront full of recycling, rationing, “Victory Gardens” and other acts of adaptation to scarcity. Same with other European countries when they weren’t being bombed or invaded.
WWIII would entail a different set of challenges mostly ranging from a lot of land for food being destroyed, the people making your creature comforts destroyed and….at worst….a Mad Max world (with none of the more fantastical elements) or no world at all!
Finally; Most of you would be the ones hunted down by the real life equivalent of Toecutter/Humongous/Immortan Joe and his goons or dying from starvation….Or it won’t be as apocalyptic and the military re-institutes The Draft and your fat butt is stuck in an obstacle course while a guy wide-brimed hat is yelling at you….then you blow up in another country.
Even if my examples are taken too much from movies, the point’s the same. Everything’s interconnected and you WILL be inconvenienced at least by a new big epic war.