"<Democrats/Republicans> want to destroy the country" is ridiculously unlikely just from first principles.
Take a mental step out from your own country and look at people from other democracies, where the divisive issues are different, and you'll find in all of them people who believe that the rival big tent party is malevolent.
Partisan ideoculture is a waste product of democracy - parties are incentivized to encourage in people a vague hatred of the opposite party instead of having them focus on concrete policies or issues. Getting ensnared by it is shameful.
A possible example in humans is the boob. Other primates don't have boobs – they are flat most of the time and only swell for lactation. Maybe, at the beginning, swollen boobs was a sign of fitness, then human males got really into swollen boobs, then human females started padding them with fat to appeal to the males' instincts, leading to the persistent round boobs we witness today – even if the pad of fat isn't actually very useful for lactation.
It seems odd that humans have such extensive female ornamentation, something which is barely ever seen a...
It's really puzzling that evolution decided to manifest taste receptor signals as qualia. You can absolutely imagine a counterfactual human whose whole decision process about whether/what to eat is subconscious, and the human just gets a reward signal when it's eating a good thing. Food selection seems like a very simple ML problem, simpler than e.g. metabolic regulation, that could have just been done by the unconscious brain.