Back when American culture was intact and you might not know your neighbor down the road personally but you could be reasonably sure that he and his family had more or less the same values as you and the same loyalty to the American way of life as you, this whole idea of sacrificing yourself for some random stranger might have had some nobility and honor to it. But now, a ship like the Titanic is just as likely to be half full of people who hate you and your way of life, and despise everything you hold dear. In such a circumstance, your responsibility would be to your family first and foremost, which would include keeping yourself alive to care for them.
Chucking your own life away without proper thought, especially when it might be in the service of people who despise you and your culture at the expense of those who rely on you, is not only not noble, it is foolish and counterproductive.
There is no way I would sacrifice my life, simply as a conditioned reflex, for some purple-haired, gender fluid, communist b!tch just so she can continue to crap all over everything good in the world, let alone for someone from a hostile foreign culture. And not all commie b!itches dye their hair purple either. The men on the Titanic had the luxury of knowing that those who survived due to their sacrifice would most likely continue their civilization, not work to destroy it.
Excellent point.