Handguns were once 'the great equalizer', giving the power of a soldier to the common man, and not really requiring a great deal of skill or strength to use. You still need the nerve, and you're still going to be in a dangerous situation.
With a drone, I could have it fly to wait on somebody's roof for them to come home, use license plate and facial recognition for target confirmation, and then shoot them in the face as they walk to their front door.
It's horrifying. It's also equality in a way that handguns could never supply. Anybody with access to an electronics store and the Internet can do it with some effort.