As stated on "Five rounds rapid" tropes page, it's not like military can just throw hands up and say "we won't fight it, it's immune to bullets!".
That goes double for enemies who go for "kill all humans" goal.
They can sail faster than any ship, and no cannon can make a dent on them! They are the demons of the Caribbean!Navy, Spanish ships, it doesn't matter! They attack anything as soon as they see it!The pirates are only taking advantage of the rumor to dress their ship in a similar fashion! Don't let their appearance fool you!FIRE!"A lie is like a snowball; the longer it goes on, the bigger it gets.", that is Luther's words. The more you exaggerate a rumor, the more frightening it will get.Prepare the cannons!Huh!?But, sir, that thing...