I wouldn't worry about the "AI" aspect and cheaply mass-produced aspect of that fictional short film. At least not for a couple more years given how terrible and expensive the existing consumer "follow me" drones are (most of which are not computer vision based). Especially at the size depicted, it can't possibly fly for more than a couple minutes if it also needs to process a video feed.

In that case, a dumb human remote-controlled flying machine gun achievable by hobbyists is about just scary (2012): https://www.youtube.com/watch?v=SNPJMk2fgJU

But mostly because of the machine gun.

Similarly in the kamikaze drones case, just make sure no one can amass a large amount of explosives they can strap onto quadcopters.