Having laws is generally a good thing when they are enforced. A law that is not enforced, selectively enforced or not enforceable is actually worse than no law since it gives power and agency to the enforcer without providing much to the people.

Edit: this being said, the New Hampshire laws above seem to be mandating that the data is deleted. Not that it is not accessed. It seems like pretty good start.

But there also could be a law stating "do not set up mass surveillance camera network in public areas".