Why the US and Japan didn’t shoot down latest North Korean missile | Ars Technica

If a missile launched by North Korea was deemed not to be a threat to Japan or the US or South Korea, the best choice available to the US and allies would be to simply observe the launch and collect data. Missing a shot at a missile just passing over Japan could have far-reaching political implications, as it would suggest that anti-ballistic missile systems are incapable of protecting people in South Korea, Japan, or Guam. And if a shot hit the missile, it could further provoke North Korea into much more dangerous actions.

Source: Why the US and Japan didn’t shoot down latest North Korean missile | Ars Technica