Stevie-Ray, the thing about that is, what do you propose to do about it?
Most of us agree that RKBA should apply to the individual; that being the case, most of us should also agree that rights come with risks attached.
However, there is no right to training with any particular instructor, and I personally think it's a good idea for instructors to have at least a basic, good-faith screen in place for some subjects.
DHS now requires extra procedures be followed prior to providing flight training to a foreign national; I'm not sure such procedures would be practical to apply to firearms training.
However, even those procedures put in place would not prevent flight training being given to a US citizen would-be jihadist. The home-grown types are going to be a bigger problem, down the road.
But again, how do we counter that without giving up larger freedoms?