The problem isn't zero upside, as other commenters have pointed out. The cameras have legitimate, lawful, and useful purposes. You will not gain any traction with the public or with lawmakers as long as your arguments ignore that reality.

The problem is that the downside is unbounded.

We clearly don't have the control over our governments, in either direction or degree, that would be needed to ensure that the unbounded downside of ubiquitous networked cameras won't manifest itself.

What's the upside then, since it is so clear to you? Show me the stats on how these cameras actually reduced crime instead. Because to me they only show a possible decrease in one form of crime and a guaranteed increase in another.