So if NK attacks anyone but SK, we can stop it?
I am sure this makes the South Koreans feel better
If NK pulls off a surprise attack, the South is fairly screwed even if we shot down every single missile aimed at them. We can’t shoot down artillery shells, and the Kims have enough artillery stashed under mountain bunkers within range of Seoul to pretty much level the place. Ships can’t do much when the enemy is dug in like a 20 minute drive from your capital.