Ah Yes, the FAA should crack down on flock of birds. Throw the book at them I say.
The problem is that the Quad can be flown by a local village idiot, and often are. The technology has de-skilled the process of flying an unmanned air vehicle, so that said idiot, who either does not know or does not care about the consequences of his actions, can partake. To the public, and I suspect the authorities, they will not be able to differentiate between what we do, and what the village idiot does.
John