Here is an interesting commentary that claims “Republican Or Democrat? Your Political Leanings May Be A Result Of Your Physiology“. A few excerpts:
For example, people who react more strongly to bumps in the night, spiders on a human body or the sight of a shell-shocked victim are more likely to support public policies that emphasize protecting society over preserving individual privacy…
Maybe liberals and conservatives have difficulty understanding the views of the other side in part because they experience threats differently
I always tell my sons: watch the pusillanimous kids at your school. Those are those ones that will typically start life as Liberals… until they get mugged.