Maybe so. Turns out that there are significant brain differences in liberals and conservatives. And it's a better predictor of political orientation than family culture. Turns out, liberals have a more robust anterior cingulate gyrus, which mediates things like evaluating successes and errors, reconciling conflict, and so on. Conservatives tend to have a more robust amygdala, which is good at threat recognition, danger avoidance and applying emotional meaning to perceptions. Animals tend to become more aggressive when the amygdala is stimulated.
Both of these are useful functions, but it does explain the old aphorism:
"Liberals tend to be friendly and open because they figure everyone is pretty much like they are. Conservatives tend to be surly and suspicious for the same reason."