I'm not sure I relate to the "fairness" vector in conservatives being weaker than in liberals. I find most conservatives to have a VERY strong sense of right and wrong, another way to describe fairness.
It's my perception that liberals approach fairness, the violation of the sense of right and wrong if you will, differently than conservatives. I find the difference along the lines of the old proverb about giving the man a fish, vs. teaching a man to fish.
When a liberal sees injustice, his reaction is to give the poor fellow a fish, so he may eat. Preferably someone else's fish, but that's another discussion.
When a conservative sees injustice, he suggests the man learns to fish for himself, preferably by pulling himself up by his boot straps.
The difference, at it's core, is the liberal belief that justice is in the outcomes of life, where the conservative sees justice in the equality of opportunity. The liberal wants to distribute the goods in a fair and just way among everybody, whereas the conservative is content to simply have fair and just opportunity for everyone to obtain their own goods (equality and justice in the pursuit of happiness, if you will).
The psychology behind this difference must be interesting, and I strongly suspects it correlates nearly perfectly with the locus of control of the individuals: I suspect liberals will have a much more external locus of control than conservatives. They do not feel they can influence their lives outcome nearly as much as a conservative does.
