The traffic signals in one intersection a block away from my house include six cameras. I don't know what they're all for... but I'm guessing that it would be a bad idea for me to trundle my homebrew trebuchet up to that intersection and start chucking grenades around.
When you are discussing "chucking grenades around" in your own neighborhood, it seems that cameras are the least of the worries for peaceful, law-abiding civilians in your area (not to mention police who are just doing their jobs).
Why it is publicly acceptable to talk like Timothy McVey?