It's not much more of a threat to society than a handgun. A WMD it is not, unless you make a lot of these and launch them at the same time, which is probably less effective than an H-bomb. (The one major difference between such a drone and a handgun is you might be able to target politicians and other people who're hard to shoot; a somewhat higher mortality rate among politicians is hardly a huge threat to society though.)
> there is a huge military and economic interest in technology and AI
There's also a huge interest in nuclear energy, and it doesn't follow that a consumer should be or is able to own a nuclear reactor. If anyone took the dangers seriously, it wouldn't be that hard to at least limit what consumer devices can do. Right now a single botnet made from infected consumer PCs has more raw computing power than the biggest tech company server farm, which is ridiculous if you think of rogue AI as an existential threat. Actually it's ridiculous even if you think of "properly controlled" AI in the wrong hands as an existential threat; the botnet could run AI controlled to serve the interest of an evil programmer. Nobody cares because nobody has ever seen an AI that doesn't fail the Turing test in its first couple of minutes, much less come up with anything that would be an existential threat to any society.