Make them smaller and give them a sharp pointy end. Ask the public to name it. Reject “Stabby McDroneface” as “it sounds like a joke”. Be surprised by the first amateur reproduction. Use the moral outrage to ban all drones — even those tiny little drones that can’t life a single jelly baby. Realise drones are still useful and make and expensive license scheme that doesn’t really scale up because it’s organised with industrial era thinking instead of information era thinking. And what is old is new again.

There's already been reports of the use of toy drones for scouting and bombing in the Syrian civil war. Then there was that strange maybe-fake bombing attempt on Maduro: https://www.bbc.co.uk/news/world-latin-america-45073385