I believe the idea is to ban the use of facial recognition by international agreement, in the same way that chemical and biological weapons, landmines and cluster munitions are banned (or at least controlled). The safeguarding of such a treaty is then left to some supra-national organisation, such as the UN, etc.

In any case, I don't understand what you propose we do. Governments can fail to uphold their own laws. Should we do away with all laws? And then- what? A life of total lawlessness is better than one where laws are sometimes broken by government?