Right now, I'm only using my drone to scout nearby area and taking pictures/videos. Well, I might have used it for a different purpose in the future but I do be extremely careful; who knows I might lose control and the drone would drop and hit someone on the head. That would be deadly.
I guess this is the sort of thing the government is worried about. Now imagine the drone falling out of the air was carrying passengers, and not just a small one for personal use.