[throwitaway222]

Not everyone is as smart as someone that thinks of the golden rule "on their own", therefor religious ethics has its place.

Also, we grew up in a society that already had this in place, essentially you could have grown up on this planet instead: https://memory-alpha.fandom.com/wiki/Battle_Lines_(episode), and you would probably grab a gun, shoot someone because they had something you wanted rather than thinking of the golden rule at all.