What purpose does one have to do anything to assist another human if it does not

What purpose does one have to do anything to assist another human if it does not

What purpose does one have to do anything to assist another human if it does not directly benefit one? Our lives are short (sometimes), why should we even consider doing things which do not directly help ourselves? Why do we feel better about ourselves when we help others? Survival of the fittest says we should abandon everyone else to ensure our own survival and procreation. Why do we and animals alike have the need to ensure the survival of our species instead of ensuring the survival of ourselves or our immediate kin.

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