I sense a business opportunity here: killer drones!
These would be designed to go after and knock down the hovering picture-snapping kind, which would be easy pickings. The killer drones don't need to hover - they fly faster than the hovering kind and just go straight at 'em. Some kind of netting or framework to snag and entangle the drone rotors perhaps. Option of either hauling it back as evidence, or in true bird of prey fashion just applying a "killing blow" and letting it fall to the ground. Developing different kill mechanisms should be fun. Robot wars in the air!