Of all the training modules in my space training, in was the only one I didn't understand. If they'd framed it as "don't do this as it will kill you", I'd have understood, but the idea I'd want a peaceful end if there was no hope of rescue, I didn't agree with that, I'd fight all the while.
But now, sitting in a cramped base camp on Mars, knowing no-one else was now coming, all alone with not enough resources to survive long term, I can understand why they wanted to give me the option.
But I'm not taking it.