Wiktionary
n. (context idiomatic English) A position or point of view which is ethically superior or more reputable, in comparison to others which are under consideration.
Wikipedia
The moral high ground, in ethical or political parlance, refers to the status of being respected for remaining moral, and adhering to and upholding a universally recognized standard of justice or goodness
“Parties seeking the moral high ground simply refuse to act in ways which are not viewed as legitimate and morally defensible.”Usage examples of "moral high ground".
Tomas Nau had committed murders on top of murders to claim his moral high ground.
And now because you and he had your moral high ground to keep you pure, you have forced me to be more practical than I have ever wanted to be.
The Reverend St john's having to make with some fancy footwork to keep his balance up there on the moral high ground, so he coughed us up a list pretty quick.
The Dutchman wasn't the only one well-placed to carve out a share of the new market, and Dalgleish had wondered what impact it might have on the reputation of his newspaper group, given that its sales pitch was from a prominent kiosk on the moral high ground.
And the Kulavo, as the only one of the original Founders still in existence, had staked out a claim to the moral high ground in any policy debate almost a thousand centuries before humans had learned to kindle fire.
Barregos intended to stake out the moral high ground for himself, right from the beginning—.
If we appear to be supporting a suppressive regime simply because its opposition doesn't want to be 'taken over' by the Star Kingdom, we could lose any moral high ground in a hurry.
Similarly again, enlistment to social causes or defense of a moral high ground can set off emotional chords (which I would back against intellect and reason every time) that easily drown out any protest from impartiality and rigor.
I felt I had enough moral high ground to throw stones, but evidently Edward disagreed.
Because we're not going to allow them to rehabilitate themselves diplomatically and take back any of the moral high ground in interstellar public opinion.