To put it another way:
Charms in Exalted don’t define what is moral.
You define what is moral.
Then your Charms do what you think is moral.
So if you think that maximizing utility while minimizing suffering is moral, your Charms will do that.
If you instead think that murder is great and slavery is keen and suffering is just the best, your Charms will do that.
Your Charms don’t care.
Unless your a Kerisgame Infernal. In which case a few of them care. But only about what you tell them to. You just have to actually get them to change their minds if you have changed yours.