Yeah; technology marches on, with GPS and smart phones, etc., but a balloon, helicopter, and many other items could be fitted with control apparatus and carry a payload to a target. Not many would set up a Trebuchet across from the White House today....
The point is, nutcases put bombs in their shoes, shove explosives up their asses, etc., and you can't "REGULATE" behavior or toys simply because nutcases can buy them. It's stupid to give up ALL your freedom, and strip-search grandma while letting towelheads go through because of "profiling" lawsuits....
Get a grip, America.
I know. It would make more sense to regulate young male muslims who have studied physics or engineering. However, remote control models have reached the point where they can be used as an effective weapons delivery vehicles, and not for all that much money. All that’s missing is military grade explosives.