Desperate times call for desperate measures. When facing overwhelming material and technological superiority suicide weaponry becomes increasingly viable
Over the centuries, the thieves, assassins and secret agents who operate within the underworld have come up with many ingenious devices for stealing and murdering, many of which are disguised well enough to be carried in plain sight.
It is not considered a crime if a ship's crew mutinies against a captain that is obviously unfit for the post (dangerously incompetent, insane, or overly cruel). Assuming, of course, that they can prove it.