You've said it all. It's emergencies. It's just in case of emergencies. For example, and you've probably heard this, during the pandemic, a ship came in with a new variant of COVID-19. We could not stop it. It could come to the port; it was allowed to come here. This would give you power in emergencies. We could have said to the boat's crew to stay there for a while and to make sure everything is okay, but “No, we couldn't have a boat with a new variant of a very dangerous disease on it”. We're a G7 country, and we don't have the power to tell that boat, “Whoa, hold on for a second; you can spend a few days there until we control the situation”.
That is exactly what this is for.