>Some people saying: just drag it off of the sand. Okay! And what happens when that causes you to rip a hole into the hull of the ship? Now it's really stuck.

Not just that, but don't forget the inertia. The moment the ship gets unstuck the force needed to get it moving, multiplied with the ship's huge mass would create such a huge momentum that it would be very hard to stop it from hitting the other shore with the stern.