Duane said:
So your saying a couple hundred grams of C-4 rolled in ball-bearings/ BB's flown into a large crowd wouldn't do much damage
That same "bomb" can be carried in a purse, a backpack, deposited in a trash can, sling-shot-ed into a nearby area, dropped from a window of a tall building, thrown over a fence, planted in a shopping cart, mixed in with the mail, floated down a stream, sewn into a life jacket, placed as a payload on a launched firework, mounted on an RC car, surgically planted inside of a dog, disguised as pizza boxes for delivery, hidden in a basketball, thrown from the window of a passing bus, formed to look like a baby wrapped in a blanket, thrown from a sewer drain, etc etc etc. And that's not even factoring in suicide attackers.
The point is, one can do quite a lot with many, many things/activities that already exist. Just because a new item/technology comes along doesn't necessarily make it uniquely dangerous - it just takes time for people to understand the reality of that object. With quadcopters, it's the idea that one can move a small item in 3D space more easily. Not more stealthily, but any stretch of the imagination, but just in ways that people aren't used to seeing (which is why the video and photos are so engaging when you see an area from a different view than normal).
Best example, the lady that spoke at a city counsel meeting scared to death that a "drone" might be able to catch her leaving her work and follow her home to where she lives! Like no one could follow her in a car, look up her address in city records, put a tracer on her car, etc etc etc. Just an ignorant way of looking at something new.
/rant off. ;-)