Katharine Houreld in the Chicago Sun-Times:
• Owners fear pirates would be more likely to continue shooting once on board if they confronted weapons.
• The company might be held liable for deaths or injuries inflicted by someone on the vessel.
Graeme Gibbon Brooks of Dryad Maritime Intelligence says that another problem is that merchant ship crews would be outgunned because sailors must conform to the laws of the ship's flag carrier as well as the laws governing ports they visit. Often that means that the crew can only use shotguns--no match for pirates carrying longer-range automatic weapons.