In their eyes, "morality" (justice) always trumps "truth". And they apply justice through class-action trials of historical social arrangements. And this "frames" all arguments with said progressive. In other words, every argument gets "framed" as a moral judgement, and not a question of truth, with their argument framing self-deprecating cultural/ ethnic denunciations establishing them as moral arbiters and authority.
Republicans are the truth party. Democrats are the justice party.