At a guess, perhaps the fact that you can't actually tell it's smuggling drugs?
What if it was just a research sub, or one somebody made in the back yard(Don't laugh, it's been done)? Imagine the outcry!
Without physically boarding the vessel and searching it, no matter if it's a sub, ship, airplane or hot air balloon, there's just no way to be sure it's not just somebody out for a joyride.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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