Cameras are a tool of authoritarianism because they tell you in no uncertain terms that someone is watching. Pointing a camera at a space changes how people behave in it. There is no way around it. Maybe you don't value what they destroy, but it is hard to deny that something is destroyed.
Imagine kids playing. Do you think they behave the same when no adults are watching? And do you think it is good for mental health to have zero "unsupervised" time?
And then, let's not be naive. After Snowden we know that the reach of the government knows no bounds. Every private camera is potentially public. Everything that is recorded is potentially recorded forever, and sifted through by increasingly powerful algorithms. In this realty, one less camera is always a little bit more freedom for everyone -- to do both good and bad things, of course, but I would rather live like a free adult than as a constantly supervised child, always submissive to Society with a big S.