From an atheistic perspective (yours), how is evil derived from stardust and protoplasm? From your worldview, on what grounds would you even deem something as evil, if it's all subjective at this point - some are racists and proud of it, some enjoy rape, porno, or pedophilia.
If you think that universally, all men agree that murder is wrong, how come when a dog kills a cat or squirrel it is not considered as a wicked act?
You're overlooking, or taking for granted the fact that humans have been endowed with a conscience and sense of morality (created in the image of God).
Your demand for justice indicts your perspective that there is no God, spirituality or absolute morals and truths.
Morals clearly aren't absolute at all, since they keep evolving over time.
We used to think slavery was okay. Then we changed our minds.
We used to let racism rage so much so we didn't even have a word for it. Then we changed our minds (and still in the process of doing so).
And so on.
It is us humans who are at the steering wheel of this moral development.
These modern morals and humanistic values, are not in line with ancient religions that claim "absolute morality".
What those ancient religions do line up with though, are the general morals of the sub-culture at the time where the religions originated.
This is why the bible is fine with slavery and regulates it. It is why it says that gays having sex should be put to death.
It is why it is misogynist.
These are things that reflect the morals of the culture it came from.
We are social creatures. Like in all social species, it necessarily goes hand in hand with certain "rules of conduct". This is important for the group to survive and prosper. The strictest implementation there is "there is no *i* in team". Living socially is always a balance of "me vs the group", and more collectively your group vs other groups.
This inevitably leads to conflicts of interest. So as a group, you need a way to resolve such without ending up in anarchy and dissolvement of social structures. Together you are strong, alone you die.
I don't get why people are surprised that there is such a thing as morality. Those are just the abstraction of the "rules of conduct" that a human has within his social group.