the studies you cited point to the fact that tensions increase and feelings of community cohesion decrease in mixed communities. This is due to the different groups not trusting each other. This could be solved if people started trusting one another.
It takes billions upon billions of dollars to socially engineer people in this way, so that they run counter to their very nature, and their natural desire for Ethno-Cultural self-preservation & homogeneity. My school teachers tried to engineer me, to run counter to my nature, for the *entire length* of my education. This shit made me MISERABLE and depressed as fuck, because I was *constantly* thinking of starving African children abroad, and how I could potentially help them, even though I literally cannot do anything to help them at all. They are a lost cause, and the West shouldn't be spending as much money on Africa as they currently are (most of their food is imported from abroad, at this point)
Additionally, if your solution to a problem is contingent upon "if everyone simply just", then it's not a solution to a problem, because everyone will "not just" as you want them to.
As soon as you learn a few inconvenient truths, all of this propaganda and brainwashing breaks apart, completely. A Chinese or Nigerian person need not explain why he desires Ethno-Cultural self-preservation & homogeneity for his Nation-People organism, likewise I should not even have to offer an explanation why I desire the same thing as the hypothetical Chinese or Nigerian. It's just self-evident that on a timescale of centuries or millennia my people will go extinct because of retards that insisted we treat exactly every person & group the same in society, despite them being different (with the exception of le hateful bigots, of course) because the alternative is to hurt people emotionally.
This is due to the different groups not trusting each other
Also, this *could* be a genetic impulse, therefore it could be near-impossible to change. I'm not going to trust a Muslim the same, because his religion tells him to behead all infidels, and I'm not going to trust a jew the same, because his "holy book", the Talmud, tells him that Jesus Christ is burning in human excrement for all eternity in hell. The Buddhist seems to be peaceful, while the atheist is a mostly soulless consumer, from my experiences (I used to be an atheist, lmao)
You haven't cited empirical problems that arise solely from the presence of a specific racial group, only from tensions between groups
I really don't want to share racial crime statistics, social benefit statistics, alleles that disproportionately appear in African Americans and predispose them to violence regardless of environment, genes that make Asians and Caucasians more intelligent, as racial groups, on the average, or anything else, because you would just call them racist & keep thinking in the ways that you do. You'd also use an appeal to triviality argument, and say that it "doesn't really matter" in the end because the differences are "still small", and thus we come back to my previous point:
"There is no argument here, unless you're totally okay with making your country objectively worse, simply to avoid being called racist in the end" - T 700 Z
Current science is debating on how much of cognitive differences between racial groups are caused by genes, and how much is caused by environment. It's called the nature versus nurture debate. We do know that it's greatly influenced by the environment, but we also know that nature plays a significant role as well. You could say an individual exception disproves a rule, but to me that's just complete retardation, I'm afraid.
My people cannot afford to play this fucking game anymore, we're less than 10% of the world's population at this point in time, yet still called "majorities". What a shitty situation, and even more so when I've got traitors among my own labeling me a bunch of shit, most of which no longer have negative connotations to me, simply because I think in a different, objectively more correct way.
Again, use an appeal to triviality or emotion, I don't fucking care.