Have conservative values and behaviors been more fitness-enhancing than liberal ones over long stretches of evolutionary time?
Could it be that conservatives are Neanderthals and liberals are freaks of nature? Could it be that there's a part of the brain that overrides a wide variety of evolved modules which produce "instinctive" behaviors, and that this part of the brain is more active in liberals than in conservatives? Could it be that the reason why conservatives are generally happier than liberals is because conservatives' lifestyles feature more of the things that humans evolved to enjoy, like membership in a close-knit group of like-minded people? Could it be that conservatives and liberals can learn from each other?