"social contract", re: decentralization and power dynamics
Thinking about it more, I think my intense aversion to the framing of a "social contract" is for the same reason.
Defending government policy with "the social contract" does the exact same thing - it doesn't actually do anything to distribute power over that decisionmaking, but it *does* diffuse the accountability to "everyone".
The politicians had the power, but they "can't be blamed for doing what the people want, they were voted in". The people themselves do not actually have the power to influence policy in reality, but they are pointed at as the party to blame.
End result: nobody is *actually* accountable for the choices made by a select few.