The Southern states that I'm aware of which have "strong economies" got that way by slashing worker and environmental protections. I don't think that's actually a compelling counterexample.

"the states with the lowest gini co-efficient are the ones that are the least diverse" seems a better fit.

Diversity is just a statistic, it's neither good or bad in either direction.

Not all forms of diversity is strength.

Mixing a wolf with a bunch of sheep isn't diversity, it's dinner time.

Racial purity ain't all it's heil'd up to be either: https://www.nature.com/articles/s41598-019-38571-1 https://www.newscientist.com/article/2342731-neanderthal-fam...

Have a barbie, find some middle ground: https://www.youtube.com/watch?v=yGdj1TwBU1w

Inbreeding in small populations (your first two links) is not relevant, and your third link is a false equivalence.

One extreme counters another extreme, the point is that neither are relevant, the third link is there for fans of The Bell Curve.