Herodotus tells us that when Leonidas selected three hundred Spartans to face the Persian army he chose "all fathers of families, who had left sons at home to succeed them". My understanding is that this is generally interpreted that if men have to die, particularly for their country, it is better that they have families.
I think the reverse is true now. This is shown in the way the threat of violence was made by Senator Brian Boquist when state police were deployed to try to round up Republican lawmakers and he said "Send bachelors and come heavily armed". I interpret this as relying on everyone understanding that if men have to die, particularly for their country, it is better that they do not have families.
Has this apparent reversal in ethics been studied historically? It is something that has changed over time, perhaps related to a more individualistic world view that many people have today? Is it something that varies more with place or culture, in that "warrior societies" are more likely to think it is better that those who are more at risk have families?