First off, relative doesn’t mean everything is equal. It just means everything is related. Killing someone is bad, Killing someone who is about to machine gun a crowd is not so bad. Context.

The problem is that we assume a top down, abolutist system of morals, that doesn't stand up to logic.

Good and bad are not a cosmic dual between the forces of righteousness and evil, but the basic biological binary of beneficial and detrimental. Like yes/no, left/right, up/down, on/off are binaries. What is good for the fox, is bad for the chicken and there is no middle ground, other than the energy of the chicken flowing into the fox.

Yet to function as cohesive social communities, we need some collective sense of what is right and wrong. Necessarily foxes and chickens are not going to form a functioning community.

This could even apply to emotions and logic. We have many diverse impulses and desires, yet to function as a viable individual, we have to have some logical framework to decide which emotions to encourge and which to discourage. At least those in direct conflict with each other.

We have an ideals based culture, with monotheism as its primary framing device, but the logical flaw of monotheism is that a spiritual absolute would be that essence of sentience, from which we rise, not an ideal of wisdom and judgement, from which we fell. More the new born, than the wise old man, but religion is more about social order, than spiritual insight, so we have this father figure law giver as the source, but structure is not source, it is the energy bubbling up through, which coalesces as structure, that is source.

That life flowing from one generation, or moment, to the next, not some perfect being, or state of being.