re: Reasonable questions
I worry a lot about our assets in low Earth orbit being vulnerable to attack by rogue nations. Most of these assets have easily-trackable orbits, or even, in the case of the ISS and others, detailed statistics in the public domain.
A rocket that can attain orbit to attack something is not going to be easily obtainable except by advanced nations. However, a rocket that can simply attain orbital altitude is a different kettle of fish, although I don't have the numbers to define exactly what kind of missile can do this. One of these, a warhead filled with explosives and shrapnel, and some damned good timing, and anything in LEO is scrap.