What about a guy in a Cessna and a high res camera. You going to shoot him down too?
I think shooting down manned aircraft and its crew/passengers or damaging property has vastly different legal consequences…
Besides, now that I mention the law, it's not like you can't grab a pair of binoculars, note down the aircraft's registration number, investigate on your own/hire a PI and take legal action, whereas the only practical (if a bit extreme) defence against a tiny drone would be, IMHO, to outright shoot it down (using an RF jammer could wreak all sorts of havoc and would be potentially illegal, obviously).
By the way, even though I loved the video (and especially the close-ups… I know, right?) I do agree with those that say that flying a drone this close to a structure (be it private or public) should be illegal, if it isn't already. There's a reason why model aircraft enthusiasts perform their demos near crop fields or in generally natural, sparsely populated environments, and though the drones are less dangerous for people on the ground, they raise all sorts of privacy issues and can be extremely damaging to passenger jets.
The fact that AI's drone flights, in their official videos, are much more restrained, and that they include a stern warning about flying drones so close to nearby airports just goes to show how much more responsible they are. Also, even though Apple has been much more open as of late, I'm guessing the Gizmodo and ThinkSecret cautionary tales are (or should be, in some cases) still fresh in bloggers' minds…