First to KNZ's question about weapons available to the civillian population that could take down a drone. It depends really on how high up they're flying. But there is quite an impressive array o really good rifles designed to take big horn sheep from mountain tops. A long range elk gun with a good scope might not be able to take it down, but it could hurt it in regards to the electronics.
As for not freaking out over police helicopters, there's the issue of juristictions. For some reason, some have in their heads that local and state agencies are the ones supposed to deal with Americans in America. Obviously, there are exceptions like the FBI or Secret Service. But they think drones, they think military or CIA or NSA or other scary acronym. And those guys are sulposed to concern themselves with dark people in third world countries who wear either turbans or general's military uniforms. Not to go messing with ordanary hard working Americans.
I hope that helps.