Those were planes on strings..........
I flew those, too. They were called (and still are), control-line models, but we had the fanjet engines in some of the F-4 Phantoms, Sabres, and other military models, and even had the 4 engine 1/4 scale WWII bombers like the B-17's that would drop "bombs" on targets.
Today, with the smart phones with GPS, etc., you could easily fly to a target "Kamikazee" and crash the plane into a strategic target.
The point is, Terrorists will ALWAYS come up with new ways to circumvent the Law, and the general public will be FORCED to jump through all kinds of hoops and Fees to purportedly defeat the attacks....look at the TSA, and how they treat regular people, while letting the towelheads have their non-profiling-way through the Gates....