I think that we can acknowledge the biological reality of differences in the races without being hateful about it, so I would agree, indeed, with any statement that plainly said "we can't hate people for their race" or "racial supremacy is bad". Those are completely agreeable statements. Racial supremacy is hatred since it, as far as I can understand, seeks to dominate the other races. What I will say is that humans naturally differ on an international scale of comparison between them (stick a Chinaman and an Aboriginal next to each other and you'll need not a notebook to count their immediate similarities, but a sticky note), and ethnic conflicts persist even as the Earth otherwise lives on in relative stability compared to the other millennia it has gone through. The genocide in Rwanda, the wars in the Balkans, the conflict between the Jews and the Palestinians, you could identify that other factors contribute to these, but it all comes down to ethnic lines overlapping into different territories when you get to the root of the cause. God gave us this whole Earth to live on. Noah's sons didn't just stay in the Holy Land with their dad to maintain one group of people forever, they went to their own lands. Shem and his children to the rest of Asia and even, eventually, the Americas, Japheth and his children to Europe, and Ham and his children to Africa, and there the various peoples of Earth developed their own traits and ways of life, slowly spreading across the lands, filling this planet. It is against God's vision to unite the Earth's peoples before he unites heaven with us in the New Earth. It will be an act of the anti-Christ when every people are ruled under one empire (Revelation 13:7, "and there was given to it to make war with the saints, and to overcome them, and there was given to it authority over every tribe, and tongue, and nation."). If we just shove all the descendants of Noah's sons back together in one place, things are obviously going to be unstable. Just look at where we are now! The costs of racial diversity clearly outweigh whatever positives it can grant us at such a scale as we have it. We shouldn't be hurting every single people on Earth by shoving them all in one empire, taking the greatest minds from their lands and hammering them down into the places of our own. There is very clearly enough space for all of us on this planet to enjoy independent sovereignty, where our cultures can flourish, without intruding upon each other to such an extent as mass ethnic population-invasion, so we ought to use that space for the sake of verily maintaining peace among all of mankind.
