Simply put, when nations base themselves on diversity, they open the doors for "tribal" like groups of people with different beliefs, races, and ethnicities to separate and not work together, therefore creating a society where no one gets along.
America has tried this approach in the presenting holidays like black history month and, Latino heritage month. America has also done this in pushing the LGBTQ+ agenda, and dividing the political parties into two extreme sides, and has in doing so, divided different groups of people so far apart, that we cannot agree on one single thing anymore soley based on who you are, or what you believe in.
Nations, and societies have to have at least one thing that unites us all and causes us to come together as one nation.
Now I'm not saying that we shouldn't have different believes and ideas to ourselves and communities, but what I am saying is that the whole point of America is that we can have differencing opinions about things, yet still get along. Division is not something we should be promoting, and instead we should be uniting as one nation, under the basic believe and right that we all hold dear. Freedom.
We should not be enforcing ideas to each other, rather living along with one another despite our differences. NO one should be defined by what they believe in, what they look like, or what they hold dear. As Americans we should all hold one definition of ourselves.
We are all Americans, and that is the only definition that we hold.