Conservatives, I believe, are much much wiser about the limitations of the individual, about the flaws of reasoning, and about the need to anchor us in a past. Liberals tend to be very high on openness to experience, liberals love change, love diversity, "the very fact that something is an old idea is a reason to doubt it, it probably comes from a time of patriarchy, it's outdated".Diversity is chaos, for sure.
I recently discovered that the metaphor of a wall is a great acid test for separating liberals from conservatives: if you tell liberals there is a wall over there they'll say "oh well let's knock it down, walls are bad, we need to knock down walls, we need to move around them, we need free flow, and no obstacles".
And conservatives are much wiser about the need for structure, the need for limitations. If everything is possible, it's very hard for people to find satisfaction: this was the great insight of the sociologist Emile Durkheim, another liberal who, basically when you read him today, sounds like he's onto some great conservative ideas.
So I think liberals desperately need to read some conservative theory to understand that a world of freedom, mobility and diversity is a recipe for a world of chaos, anomie and social disillusion.
I think Haidt also believes that emotions are our prime motivator, which is encouraging, but he approves of gay marriage, which is not so encouraging.