People
Commandment Number One of any truly civilized society is this: Let people be different.
— David Grayson
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
If a society had a first rule, this says it would be to allow people to differ. Calling it a commandment gives it moral weight, and "truly civilized" makes tolerance the mark of maturity. The idea is that difference isn't a problem to fix but the thing a good society leaves room for.
Context reviewed