"Hey, Lab guys (long time beneficiary of GOVT contracts), we need to prove a model rocket can be adapted into an anti-aircraft weapon by terrorists. And to make a video of it which will scare the bejezuz out of the sheeple........ No, not just politicians, the public, too."
"No problem, Agents (more money, more GOVT friends). Okay, send a guy out to buy something, anything, that has to do with rockets. That will cover easy availability of the components. For the actual test, just leave that to us (a dedicated research firm who specializes in this kind of stuff and who has expertise, resources, and government friends unavailable to common terrorists)."
[Lights flash and eerie sounds come from the Lab where scientists and engineers develop a carefully designed and analyzed anti-aircraft test to show model rockets are dangerous to airliners.]
"Okay, Agents, listen up. It's pretty hard to hit a moving aircraft with an unguided rocket; that's why its not usually even attempted by military organizations. But, we can use anything a terrorist MIGHT use, right? And we don't really HAVE to hit anything, just make people believe we MIGHT be able to, right? That'll scare em. And the simple fact the GOVT is testing the idea will make it seem plausible to most, anyways. All you need is a "proof" of concept to stop rocketry dead in its tracks. Now, take all this stuff out to the Air Force Base and follow these detailed instructions."
[Test ensues. Results are as expected based upon requirements of test; they found what the test was designed to reveal.]
"Thank you, Senator Schmuzer, it's always a pleasure to help out. Now, about the possible use of high power rifles, or [fill-in-the-blank], against aircraft taking-off or landing: we have an interesting test that makes those rockets look positively harmless in comparison..."
The fact that this "terrorist operation" experiment was uncovered means nothing, I guess.
It is trivial to design an experiment to yield predetermined results. It is the standard MO for unethical scientists and FUD mongers of all types; environ wackos, health wackos, govt wackos, etc, and the public laps it up as "proof" of something. (A REAL experiment doesn't "prove" anything. In fact, the most useful and valid experimental results DISPROVE hypotheses.) I have NO doubt the BATFE will "prove" their experimental hypothesis, whatever it may be. Then WE will look like the "bad guys", again, trying to shoot holes in their experiment. Its just another PR ploy and it WILL work, I'm sad to say, on Congress and the Public.