If rationality itself generates cooperative solutions under idealized bargaining conditions, universal defection reflects a failure of modeling assumptions, not rationality as such.

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Cooperative solutions(as used in game theory and bargaining): Outcomes where people work together and both (or all) parties benefit, rather than each person trying to gain an advantage at others' expense.
Idealized bargaining conditions(as used in game theory and negotiation theory): A theoretical scenario where people negotiate under perfect circumstances—like having complete information, unlimited time, and no outside pressure—to see what agreement they'd rationally reach.
Modeling assumptions(as used in game theory and philosophy of science): The basic rules and starting conditions that a theory or mathematical model uses to describe how something works; if these assumptions don't match reality, the model's predictions might fail.
Universal defection(as used in game theory, particularly in the Prisoner's Dilemma): A situation where everyone chooses to act only in their own self-interest and refuses to cooperate with others, even when cooperation would benefit everyone.

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