Normally, being in a village on fire isn't cause for celebration. But when you're a plundering pirate, and you're likely drunk on rum, a conflagration is a perfect reason to burst into song and freely stumble around and act without a care in the world.  When you're a pirate and do what you want, and you sack and you pillage and you plunder, it's all just good fun!  At least that's how Disney would have you think the buccaneer life is like in Pirates of the Caribbean!