Because moral absolutism leads to uncomfortable conversations. E.g. "Theft is wrong" is a moral absolute that will lead to NPCs reeing about hurt feelings because if theft is wrong... ...so is taxation. ...so is grandma's govt pension. ...so is the public school gulag you abandoned your kids in. ...so are the various and sundry mandates normies want enforced by tax-funded jackboots. ....so is anyone who supports any of that. Abandoning the evil of moral relativism leads to you needing to have difficult conversations with 95% of humans to the effect of "Based on examples A, B, and C you are a thief. I dont associate with thieves. Now that you have incontrovertible proof that you're a thief, are you going to change your behavior or do I need to treat you no differently than a common mugger?" Incase you haven't noticed, normies will reeeee rather than ever have such honest conversations.