There are thousands of cases of people who have rejected their survival, who have put their own lives at risk to fight for ideals, for values, for freedom and for justice, and who show that the human is not a cold-blooded animal.

Genuine self-sacrifice is most common when parents are protecting their own children, otherwise it is more of an anomaly than "the rule".

Some are brainwashed with the "hero myth" which (dubiously) promises "eternal honor" in exchange for their life.