I kinda liked how race didn't play a big role in Idiocracy. The film takes it for granted that the same "only the dumb reproduce in large numbers" rule applies to all ethnicities. Certain ethnic/racial groups may have more dumb members than others.
Nature doesn't have a vested interest in keeping smart people around. But it doesn't have a particular interest in killing them off, either. Smarts might not be a guarantee of success, but neither is fecundity. And stupidity, in almost any conceivable real-world scenario, is a liability. Stupid people will never overwhelm the smart ones. The whole system is self-correcting, without involving bullshit like God or Hope or abstract ideas like "Progress."
I don't know the best way to illustrate my argument. Maybe I'll start at the end, in a worst-case scenario.
Picture no smart people at all. Let's say a disease, brought by germy, preschool-age aliens, kills EVERY human with an IQ higher than 30. Picture a world purely populated with severely retarded folks.
That scenario has already happened, in prehistory. Everyone was a dumb monkey, throwing shit and screeching. Every time a smarter ape baby got squoozed out, on average it survived long enough to squooze out more ape babies than its dumber pals. It outmaneuvered predators, and secured more food by manipulating its pals, and thought twice before sampling those bright red berries.
Get past a certain lower threshold and intelligence will rebound. It's an advantage in almost every significant way, although perhaps there's an upper limit beyond which intelligence makes society top-heavy and unstable. Perhaps we're entering that period now, fucking with plague germs and radiation.
People are stupid now because they can be. If the balance ever tips too far in their favor, smart people will rebound. And evidence is consistent on the side of them ALWAYS having been this stupid. They weren't holding spelling bees at the Roman Coliseum. A bunch of proto-Italian fuckwits watching exotic animals eat people isn't any smarter than Idiocracy's "Ow! My Balls!" show or whatever show Paris Hilton is agreeing to right now.
If one smart group group left the dumber members behind, they'd exploit the dumb ones, inevitably. There'd be two opposing forces working against this situation, though. The smart ones would reduce the pressure to get smart. They'd become lax, and tell themselves stories of their innate superiority. They'd accomodate their less intelligent children, because in the end, it's a numbers game, and Nature would never breed out the HAVE/KEEP MORE KIDS! imperative. So the smart group would slip.
Meanwhile, the dumb ones would be selecting upwards, for the same reasons I listed above, in the case of our primitive ancestors. It would be bloody and brutal and horrible, but infighting and stress would inevitably breed for smarts.
If the two groups could stay separate long enough to exaggerate their downward and upward trends, you'd get something that the Neanderthal species must have encountered when they first encountered Homo Sapiens. The smart ones won on that occasion.
If a disease wiped out all dumb people, there'd be as much or MORE instability. You get a lot of ambitious smartypants, each thinking he knew better than that other smartypants. Dumb people make for nasty wars, but smart people make for nastier ones. Dumb people end up fighting and then backing off, like most animals after they've established social hierarchy or breeding rights. Smart people fight to kill, understanding that wiping out your opponent's genes is more practical than having to sort shit out every mating season.
Figuratively speaking, Nature just likes conflict. It doesn't give a shit who's fighting, or why. It just likes the fighting. As far as Nature is concerned, fighting works like a charm to sort things out and spread life.
Nature also breeds in things like cooperation and all that chick shit, too. It doesn't care if an animal has just slaughtered its opponent, or simply pointed out its opponent's shoelaces were untied and then skipped town. As long as it makes it home to make sweet love to its mate, Nature's got nothing against it.
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Hoya: А у вас негров линчуют
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Please to be coming on baby, lighting my fire