In fact the main value disagreement that I can see is that some leftist tend to have a pathological form of egalitarianism where they're willing to pursue policies that make everyone worse off in order to make the distribution more equal.
A few examples? (Preferably ones where the conclusion that the policy leads to an anti-Pareto improvement is based on real-world data rather than on dry-water economic models.)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Of course, for "every Monday", the last one should have been dated July 22-28. *cough*