[Someone]

”If somebody launches a nuclear ICBM, I don't care where it's heading, I want it downed ASAP”

Countries do missile tests. Some of them do not announce them because they want to avoid embarrassment when it doesn’t launch or goes boom.

If you attack any launch that looks like an ICBM, you will attack those, too, certainly if you want to down it “right next to where it launched”, as that gives you a very short time to decide whether the missile is armed with nuclear explosives.

I think that what you say comes down to that you’re willing to risk war to deny countries of doing any ICBM missile test.

[gridlockd]

Nobody so far has tested an actual nuclear-armed ICBM. Sure, maybe North Korea is testing ICBMs unannounced, and it's a big problem, but we "know" they aren't nuclear-armed. If the technology existed, these should be shot down, no matter the payload.

> I think that what you say comes down to that you’re willing to risk war to deny countries of doing any ICBM missile test.

"Accidentally" shooting down an unannounced ICBM out of precaution is not necessarily an act of war, nor will it necessarily lead to war.