Well, obviously they couldn't use "good" vs. "evil" directly, so I read it as trying to express the same thing with "concordant with the purposes and principles

Well, obviously they couldn't use "good" vs. "evil" directly, so I read it as trying to express the same thing with "concordant with the purposes and principles of the UN" vs. "contrary to the purposes and principles of the UN", such that the scope of permitted acts is intentionally very broad.