If we observed society, then we would see that people naturally gravitate to their own. Asians hang out with Asians. Mexicans hang out with Mexicans. Blacks hang out with blacks. Whites hang out with whites. Yes, of course, there are exceptions, but generally speaking diversity does not appear to be something natural. In fact, we have to force it if it is going to happen. We had to make laws to end segregation and change the workplace dynamics.
Is diversity really positive for society if it goes against human nature?