Per a couple of TED talks, there are a few psychological differences:
* liberals are hard to disgust, which may be why the “purity” channel (sexual purity type of morality) doesn’t matter to them
* conservatives tend to have greater fear of the unknown and risks, while liberals have a far greater drive for novelty, hence their urge to shake up society without fear of consequences while conservatives value preserving what works
* liberals’ lower in group loyalty leads to despising nationalism and seeking to undermine dominant group symbols; combined with the high novelty, they want immigration to break up the bland majority to add diversity and (in their opinion) make things more interesting
Doesn't make sense given national socialism. I think the latter part of the argument is correct, regarding the novelty, but the loyalty to the group mattered greatly to Communists and Nazis. Many of the communists/world socialists in Nazi Germany converted to National Socialism quite easily. Maybe it was also due to the hope that they would be the new masters, not the peons. Even though that would have never worked out for the majority of them.