The previous post underscored a basic law of human nature:
People never need the truth enforced with great, painstaking care; it's only lies which have to be pounded into our heads time after time.
Nobody goes around saying, with great fervor, "Gravity is real!" It would be silly, because it's so obvious, and no one would ever think otherwise. So it doesn't need to be driven home.
However, an expression like "Our diversity is our strength" must be repeated ad nauseum, until, through strength of repetition, it almost gains a certain weak credibility.
Likewise, nobody goes around repeating, "During the winter it's colder!" It's only expressions like, "Anything a man can do, a woman can do better" which require constant repetition.
It's an almost mathematical law: the more often and forcefully a bromide is stated, the less likely it is to be true.