No single set of values fits everyone, and a system that pretends otherwise is imposing one group's defaults on the rest. Value pluralism is the recognition that people and contexts genuinely differ on what is fair, acceptable, and important, and that a credible values layer for AI has to hold those differences rather than flatten them. This is not relativism, some floors are non-negotiable. It is the more modest and more accurate claim that above those floors, one universal setting is a fiction.
Why one-size values fail
Because a value specific enough to guide a real decision is specific enough to be wrong for some of the people it touches. Bake one definition of fairness into a global system and you have made a contestable choice for millions who never saw it. The more consequential the system, the more its single default grates against the diversity of the people under it.
What pluralism means in practice
Hard floors that hold everywhere, and above them, values that can be set and contested per context and per community, in the open. It is harder to build than a single hardcoded default, and it is the honest version. A system that can say "this is the value applied here, and here is how to contest it" is doing something a universal default never can.
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See whose values should AI hold and the values layer for AI.