If you pass on the idea that self-sacrifice is virtuous, in a persuasive sort of way (such as by believing it yourself), you’re marginally more likely to enjoy the benefits of having someone willing to sacrifice their own interests nearby when you particularly need such a person. Of course, sometimes that meme kills you. Some people are born with sickle-cell anemia and never get the opportunity to benefit from malaria resistance; evolution doesn’t play nice.
If you pass on the idea that self-sacrifice is virtuous, in a persuasive sort of way (such as by believing it yourself), you’re marginally more likely to enjoy the benefits of having someone willing to sacrifice their own interests nearby when you particularly need such a person. Of course, sometimes that meme kills you. Some people are born with sickle-cell anemia and never get the opportunity to benefit from malaria resistance; evolution doesn’t play nice.