re: Effect of private sector CATS on national security
By definition, any working orbital launch system is also an ICBM. A few tweaks in guidance, maybe. I have no doubt that for a long time, launches are going to be carefully watched, and filing a flight plan may be a matter of life and death for a pilot.
Defense systems should be moved out into space to protect all of this. Needless to say, work on missile defenses should also proceed apace, including incorporating decision systems that will take into account the idea that a lot of launches are going to be peaceful ones.