I don't think anyone objects to using these things like helicopters used to be used, to track a person fleeing from police, for search and rescue and so forth. Those are reasonable uses of this tool. But what has changed the essence of the tool now is the staying power. The nature of manned helicopters never let them be an issue wrt privacy and surveillance--too expensive for fishing expeditions and casual spying; they simply couldn't stay up long enough or unobtrusively enough. So the issue never came up due to the technology limitations. Now, these limitations are gone and we have to face the issue: do we want a surveillance state where these things casually spy on anyone/everyone? Do we want to live in an increasingly Panopticon society where we are under surveillance as soon as we leave our houses, or perhaps even within our house? I agree with you that the surveillance state is going to be a crucial legal issue for some time to come.