Technically you are correct that human agents of the state who's pay and freedom depend on compliance with a formal verification governed law doesn't prevent say one of these armed human agents of the state from abusing their arms. But it could guarantee that such human agents can't repeat there crimes systematically: they lose their arms, face fines or are incarcerated. Contrast that with: currently not even formally verified due process is guaranteed. The system is currently allowed to delude itself ad nauseam.