I don't think this quite flies. There's no particular reason to look for adaptations relating to national politics; that's a scale we didn't evolve to handle. (Interpersonal politics, sure, but young people aren't known for playing long games there.) And putting this down to explicit planning doesn't work either; we generally see shorter planning horizons among young people, e.g. in domains like finance, where we'd normally expect analogous arguments to apply. However, a youth bulge does seem to be correlated with social unrest.
So, what's going on there? I'm not totally sure, but I'd start by looking at risk tolerance.
You don't think we had triibal politics in the ancestral environment? Chimps have them.
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