That’s the thing. This doesn’t seem, to me, to be a hard decision. The actions were necessary to save the lives of millions of people. Maybe not humans, but I don’t see how that matters. On a quasi-military vessel, the decision seems simple, and not very hard. One should have sympathy for the loss of life, and perhaps some question of whether a less lethal option were possible should have been asked, but the decision seems doesn’t seem hard.
There is a thing here, which is that decisions made for large groups have consequences. Most results are imperfect. People often will die in all cases. One makes the best decision they can, and strives to do better the next time.
The biggest fault is perhaps the lack of trying to communicate(or rather, to try harder), or to consider how many beings were on the ship. Not that, given the numbers and indifference shown, the decision would have changed.
TomB