i mean, the concept for shooting down ICBMs in low orbit has been around since before we reached the moon
the US and NATO has operated a system for shooting down ICBMs in the low orbit stage since like, the 70s, except they use ground-to-air
there isnt really a difference if they're launched from space to air or ground to air, it'd probably be more successful in space because it'd be quicker and easier
i mean, it'd also be a lot more expensive and harder to restock ammunition
hes completely within reason lol, stop trying to police outer space stuff