eelj wrote:People who were raised and educated as citizens of the USA during the height of the cold war hold the right to privacy very dear to their hearts, its part of our DNA.
But you have to recognize that currently there is no privacy right involved in this case. The fact that someone drives around in public is not protected by any privacy right. You may propose that it should become protected in the future, in which case a concrete proposal would be good. But again, beware of the unintended consequences. If you only restrict governments, you tilt the playing field towards the rich. If you make it a general privacy right, you restrict many other tasks that should not be restricted. Concrete example: I go on vacation in LA, take a selfie in front of the La Brea tar pit, and post it on Facebook. Unbeknownst to me there is a car in the back of the picture, and with the high-resolution camera of my iPhone 8 his number can be read in the picture. You should probably word your proposed law such that I don't go to jail.
A citizen of LA has the right to put up a big stone monument of the 10 commandments in their front yard even if they work for the city but the city does not.
Certainly there are restrictions on what government can do. The example you give is the establishment clause: the city of LA can not establish a religion, which implies that it can not preferentially advertise for any particular religion.
Doctrinally, the civil rights apply to people. For example, I'm a rabbit breeder, and I have the right to have opinions and to voice them. For example, if our state government here in South Dakota were to propose a law that prohibits the keeping of rabbits, I would fight against that, both in private and in public. You'd see me on soap boxes at the street corner, and handing out leaflets, and mailing out flyers to voters, and hiring lobbyists. If Governor Daugaard were to try to stop me from speaking my mind on proposed laws (or on any other topic I chose to speak on), he would be violating my 1A rights, and I would get very mean with him, or rather: I would let the courts get very mean with him on my behalf.
But civil rights don't vanish completely when people associate. The rabbit breeder club that I'm the treasurer of certainly has strong opinions on proposed anti-rabbit laws. As a club (legally registered and incorporated, with bylaws and articles of incorporation files with the Secretary of State) we have a right to free speech too. We can run a full-page ad in the Pierre Capital Journal, decrying the proposed law as unjust, and calling for the governor to be recalled, or even better: confined to a hutch. We can use our club's reserve fund (usually dedicates to buying trophies and ribbons for the animal show) to pay for that ad, and to hire lobbyists.
And this is where you have to be careful with any proposal that governments don't have civil rights too. Ultimately, government entities are nothing but associations of people. One could for example define the city of LA as being nothing but a club, the members of which are the residents or citizens of LA. The members of the club have chosen to do their business by electing certain people (mayor, police chief, dog catcher ...) to organize performing everyday functions. At another level, one could say that the city government of LA is nothing but the aggregate of all staff, employees and elected officials of that government. And each of those people (whether citizens or city staff) have a right to opinions, and to free speech in voicing those opinions. And just like the rabbit breeders of South Dakota, they don't lose their free speech rights by associating. If the governator of California were to propose making driving Hummers and Harleys mandatory, the city council would be free to pass a resolution stating that convertibles are more suitable for the PCH in Santa Monica, and sport bikes for Mulholland Drive. It could run full-page ads in the local fish wrap (the LA Times, I gather) opposing the proposed macho-car rule. It could hire lobbyists to convince the legislators from Shasta to San Bernadino to oppose the new law. The city has free speech rights. You want to curtail those? What do you think the citizens and staffers of LA will think about that?
What I'm getting at: The right way to attack this is not to believe that it is already illegal or unconstitutional (it isn't), nor to make free speech illegal (bad idea, because of unintended consequences and the slippery slope), but to convince the people and officials of LA (and similar cities) that privacy is important, and that they sometimes should voluntarily collect and store less data than they theoretically could. And convince them that shaming people for doing something that is legal (but frequently associated with illegal and discouraged activity, such as hiring prostitutes) is not a good policy, because of the occasional bycatch of innocent people. Use the carrot, not the stick. We need more common sense, not more restrictions.
Sometimes friends accuse me of being a libertarian. Makes me upset, and I point out that I'm a dyed-in-the-wool liberal (admittedly, with guns). But maybe my friends are right, after all.