There are (at least) 51 governments in the USA. For the nth time, it's not a monolithic entity. After all, we have a good numbers of states that have banned or imposed moratoria on the death penalty too, and those states obviously have no compelling interest in preventing scrutiny of its reliability.

massive public unrest

No chance. People (collectively speaking) are indifferent to perfectly well-documented failures of the legal system as it is.