This is going to be like shooting fish in a barrel. Most of your links focus on one study and one of your links refers to a study which looked at amygdala volume and correlation to political orientation.
The Kanazawa study makes
clear:
The examination of the 10-volume compendium The Encyclopedia of World Cultures, which describes all human cultures known to anthropology (more than 1,500) in great detail, as well as extensive primary ethnographies of traditional societies, reveals that liberalism as defined above is absent in these traditional cultures. While sharing of resources, especially food, is quite common and often mandatory among hunter-gatherer tribes, and while trade with neighboring tribes often takes place, there is no evidence that people in contemporary hunter-gatherer bands freely share resources with members of other tribes.
That liberalism is some form of mutation which lessens survival advantage:
Given its absence in the contemporary hunter-gatherer tribes, which are often used as modern-day analogs of our ancestral life, it may be reasonable to infer that sharing of resources with total strangers that one has never met or is not likely ever to meet – that is,
liberalism – was not part of our ancestral life. Liberalism may therefore be evolutionarily novel, and
the Hypothesis would predict that more intelligent individuals are more likely than less intelligent individuals to espouse liberalism as a value.
Right here, right at the very start, is an internal logical flaw. There is nothing which indicates that giving away one's found to strangers in a tribal society is the mark of intelligence. This is a tautological argument, he's setting out to prove that which he has already assumed.
What the model ACTUALLY does SHOW is that such behavior is reckless and threatening to the welfare of the tribe. The tribal liberal takes the community's food and gives it to strangers from another tribe. Maybe liberals can't be found in tribal society because the tribe hangs, throws them off cliffs or feeds them to sharks for their behavior of endangering their tribe by showing greater allegiance to strange tribes rather than their own tribe.
Now why would a liberal act this way? This is the where the amygdala research comes into play:
Conservatives respond to threatening situations with more aggression than do liberals and are more sensitive to threatening facial expressions.”
“So, when faced with an ambiguous situation, conservatives would tend to process the information initially with a strong emotional response. This would make them less likely to lean towards change, and more likely to prefer stability. Stability means more predictability, which means more expected outcomes, and less of a trigger for anxiety.”
That explains how the larger right amygdala influences conservative behavior, but it follows that if conservatives have a larger right amygdala then liberals must have a deficient right amygdala. We could rewrite the above paragraph and focus on liberal behavior. It might read something like this (if the researchers weren't such biased hacks by only including conservative behavior in their report.)
Liberals respond to threatening situations with more passivity than do conservatives and are less sensitive to threatening facial expressions. Liberals can't recognize danger signals.
“So, when faced with an ambiguous situation, liberals would tend to ignore the information. This would make them more likely to lean towards danger and folly, and less likely to prefer stability. Stability means more predictability, which means more expected outcomes, and less of a trigger for anxiety.” Liberals would be more anxious, more like rabbits than hawks.
The greater the size of the right amygdala the greater emphasis on social empathy and avoidance of dangerous, foolish and reckless behaviors.
This brain structure finding fits the internal logic of the hypothesis that liberals are not found amongst tribal societies because their thoughtless and reckless behavior is a threat to both themselves and to the tribe and when liberals do manifest they quickly get themselves killed or the tribe kills them because of the danger they bring to the tribe.
This hypothesis actually holds together. The problem for Kanazawa is that this behavior doesn't describe intelligence, it describes selfishness and recklessness.
So what happens when Kanazawa tests for intelligence? Bad experimental design. Here is who he tests:
For example, among the American sample, those who identify themselves as “very liberal” in early adulthood have a mean childhood IQ of 106.4, whereas those who identify themselves as “very conservative” in early adulthood have a mean childhood IQ of 94.8.
He's not testing liberalism, he's testing youth. We have mountains of evidence that young people are more liberal than old people and that people tend to become more conservative with age. And here's the beautiful part, from a study that you didn't link. It's quite likely that the most individuals with higher cognitive ability tend to have better socio-economic positions, and individuals with better socio-economic positions are more likely to identify as Republican. These results are consistent with Carl's (2014) hypothesis that higher intelligence among classically liberal Republicans compensates for lower intelligence among socially conservative Republicans.
What we see from both tribal societies and modern societies is that liberalism is parasitical - the liberal harms his own group in order to gain PERSONAL advantage with another by stealing resources from his group and transferring them to the stranger's group. This behavior could be classed as a form of mental illness and the only reason that liberals survive in modern society is to due to the wealth and compassion of conservatives who allow them to remain in society rather than, as hypothesized in tribal societies, banishing or killing the dangerous, reckless and traitorous liberals.
Now let me ask you, don't you feel bad about being a parasite on society?