What is the evolutionary purpose of moral disgust?

What is the evolutionary purpose of moral disgust?

I can understand that disgust over feces or rotten food was useful for survival, but why do we feel a much stronger disgust over amoral behavior, e.g. a promiscuous slut?

What is the evolutionary purpose of asking the evolutionary purpose of thigns ?

rules out impassionate people over compassionate ones.

Preparing the human body for avoidance behavior.

Societal Conditioning. Different cultures have different disgust stimuli, so it would make sense for it to be a conditioned concept.

>promiscuous slut
Only men feel this way, and it's because if you are the alpha male, the women in your group that are more likely to sleep around results in a higher chance that the children they have will not be yours.

It doesn't need to exist a evolutionary purpose in order to have the existence of moral disgust. It can very well be a by-product of different conditions in human psychology.

Also, even if this is Veeky Forums and Veeky Forums, Hegel's dialect of master and slave can be considered too.

>evolutionary purpose

For promiscuity it is because monogamy has a lot to do with civilization and being civilized. Its basal r-selected behavior.
Girls slut shame worse than men mostly because their methods are covert and just subtle

But why did such a thing as a cultural distinction between moral and immoral arose in the first place? How can it be explained evolutionarily?