There was a TED talk on the personality differences between political orientations. The biggest differences were:
1 liberals are much more likely to be novelty seeking
2 conservatives are much easier to disgust
3 liberals tend to measure morality based on how angry / upset someone is, while conservatives tend to follow rules based morality
1. Liberals assume new is better and flock to the new (or old thing in a new name), while conservatives by nature are going to conserve the traditions that have worked pretty well for society. Liberals, in general, want to wreck what works and try to build something new, without much thought about the gritty details and lofty assumptions of how it works.
2. In the case of the "disgust", you get a much greater tendency in conservatives to value sexual purity and devalue non-normal sex acts. For liberals, the sexually exotic is something to cherish, regardless of health effects like disease rates. (Like homosexuals being 2% of population and 50% of HIV cases due to promiscuity, and even married ones only monogomish with cheating on the side.)
The rules based ethics for conservatives makes determining right and wrong straightforward. For liberals, that is frustrating - what about these complex situations? But for people in the bottom half of the population, situational ethics is too complex - you get a breakdown of society when you take away the simple rules. See the 60%+ illegitimacy rate for the working class since the sexual revolution and dropping marriage rate, while for the upper college educated class, marriage rates are back to 70%+ and illegitimacy less than 5%.
Given that we know bad life outcomes from dropping out of school to going to jail to becoming homeless to mentally ill are ALL two to three times higher for children born to a single mother (and cohabitating parents are almost as bad), breaking down the family by saying marriage doesn't matter when you have kids is responsible for the now inter-generational poverty.
And privileging the most upset or offended person over the rights of others (freedom of speech, freedom of association) has led to social justice warriors who think their right to not be offended includes the right to disrupt events, threaten speakers and attendees and demand freedoms of others be permanently eliminated, because feelings trump written rights of others.
Because liberals' novelty seeking gives preference to the smallest minority, the rights of the majority are ignored.