How is it a sickening sentiment to consider the overall consequences of throwing one's self in front of a train to save a stranger? If my wife were in the same

How is it a sickening sentiment to consider the overall consequences of throwing one's self in front of a train to save a stranger? If my wife were in the same situation, I sure hope she'd consider the effect on me and our children if she were hit by a train before entering such a dangerous situation without any understanding of the overall circumstance Everybody can't and shouldn't always be a superhero.