righteousness in a evolutionary perspective

animals compete about sexual partners to reproduce with 

female animals compete with female animals about sexual partners to reproduce with 

male animals compete with male animals about sexual partners to reproduce with 

human girls compete with human girls about sexual partners to reproduce with 

human guys compete with human guys about sexual partners to reproduce with 

if a human girl can't compete with other human girl 

then human girl try to kill other human girl 

if a human guy can't compete with other human guy 

then human guy try to kill other human guy 

in a population this could become a problem because 

if a girl has a high value 

then she is valuable to population 

so if girl has a high value 

and other girls can't compete with her 

then other girls try to kill high value girl 

if a guy has a high value 

then he is valuable to population 

so if guy has a high value 

and other guys can't compete with him 

then other guys try to kill high value guy 

these are probably scenarios that human populations have tried to handle since before humans discovered fire 

in a hunter gatherer tribe if there is a fight to the death about love 

then the best fighter wins 

whether it's an honest knife fight 

or a stab in the dark 

and the fighter that wins is probably good enough to be valuable to the tribe 

but in a civilization it's sligthly different because a scientist might not be a good knife fighter 

and a scientist could be of high value to a civilization 

so if a scientist girl is very attractive 

and other girls try to kill her 

because of love conflict about a guy 

then civilization is probably concerned 

so if a scientist guy is very attractive 

and other guys try to kill him 

because of love conflict about a girl 

then civilization is probably concerned 

some of these reasons could explain 

why righteousness is evolutionary important in a civilization 

and why righteousness is less evolutionary important in a hunter gatherer tribe 

and why righteousness is not evolutionary important at all among animals