VALUE JUDGEMENTS ARE OPINIONS
To a large extent terms like good and evil or ethical and unethical are opinions.
The catch is that if morality and ethics is defined by anything other than RECIPROCITY it is no longer internally consistent (no high trust commons, no agency, no forwarding your claimed values).
That’s the beauty of reciprocity though, it packs all that punch and then more because it lets the speaker point out the relevant operation and leave out the moral judgements.
Moralizing and justifying is begging people to agree, it’s really weak.
People get the implications of reciprocity on their own without all the bs loading, anyway.