Why is that sad? As these get more and more autonomous they will be capable of targeted assassination. The same hardware accelerated face-recognition chip in your $50 point-and-shoot camera will wind up making point-and-shoot a taboo phrase.

Well, with this kind of thing becoming more popular as it becomes more possible (thanks to improved batteries and cheap small video cameras) it's only a matter of time before it gets regulated.

Even if everybody only used them with the best intentions, someday someone's gonna get seriously hurt by getting clobbered on the head by one of these things.

Still, for now: awesome video!

Isn't this "what if" thinking the whole problem with, for example, the TSA?

Yes, someone will get hurt. Someone may even die. It will be terrible, but it will be an accident. We can't prevent all accidents, nor should we try.