I'm all for them, provided they are open source.
We could watch them, then.

As things are, any gov't money involvement with the data the cameras produce violates the 4th amendment's prohibition against general warrants.
Chatrie v. United States

However, nobody has any expectation of privacy in public.
As long as that data is public, I don't see the rub.

Phones, I would argue, are not public.
IF I want to be private in public, I can put on a mask.
(This is why license plates are a 5th amendment violation.)
But, I can't be expected to not carry my organizer with me.
To be secure in my papers would preclude phone data being public, imo.