Having recently decided that I dislike leftist politics and that I align more with right-wing politics (in theory, if not in practice), the thing that switched in my mind is: why does it matter whether or not society is fair? I think that's the wrong question; I don't see any intrinsic value in fairness.
I think the right questions are: (1) how can we improve our average level of well-being, and (2) how can we reduce suffering?
So in my view, progressives incidentally get some important issues right including single-payer healthcare and environmental conservation. These policies tangibly improve our quality of life. But all the emphasis on equality, fairness, etc? Useless, in my view.