LOL. First Japan is much more ethnically diverse than Sowell is claiming. Look up information about the Yakuza and their ethnic background. Now someone may say "See! Proof that diversity is a problem because those are the criminals." But the problem comes from the society maginalizing those groups rather than from those groups themselves. Secondly, like it or not, China is now MUCH stronger than Japan and also much more ethincally diverse. Third, WHITE Americans are about as ethnically diverse as the Balkans. Remember that whole "Great American Melting Pot" song? The Balkans are basically all white people who don't get along. Those same white people seem to do fine here in America. (I've not heard of any massive Serbian on Croat violence here in the good old U.S.A.) So the problem seems to be one of marginalization rather than one of diversity.
Lastly, anyone who subscribes to Sowell's position is denying Christianity. Yes I said it. The Christian church, from it's foundation, was diverse by design.
Acts 2:6-11 "6 When they heard this sound, a crowd came together in bewilderment,
because each one heard their own language being spoken. 7 Utterly amazed, they asked: “Aren’t all these who are speaking Galileans? 8 Then how is it that each of us hears them in our native language? 9 Parthians, Medes and Elamites; residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia,[a] 10 Phrygia and Pamphylia, Egypt and the parts of Libya near Cyrene; visitors from Rome 11 (both Jews and converts to Judaism); Cretans and Arabs—we hear them declaring the wonders of God in our own tongues!”
Revelation 14:6 "6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to
every nation, and kindred, and tongue, and people."
Acts 8:26-27 "26 Now an angel of the Lord said to Philip, “Rise and go toward the south[a] to the road that goes down from Jerusalem to Gaza.” This is a desert place. 27 And he rose and went. And there was an Ethiopian, a eunuch, a court official of Candace, queen of the Ethiopians, who was in charge of all her treasure. He had come to Jerusalem to worship."
Act 6:1-6 "
6 And in those days, when the number of the disciples was multiplied, there arose
a murmuring of the Grecians against the Hebrews, because their widows were neglected in the daily ministration.
2 Then the twelve called the multitude of the disciples unto them, and said, It is not reason that we should leave the word of God, and serve tables.
3 Wherefore, brethren, look ye out among you seven men of honest report, full of the Holy Ghost and wisdom, whom we may appoint over this business.
4 But we will give ourselves continually to prayer, and to the ministry of the word.
5 And the saying pleased the whole multitude: and they chose Stephen, a man full of faith and of the Holy Ghost, and Philip, and Prochorus, and Nicanor, and Timon, and Parmenas, and Nicolas a proselyte of Antioch:
6 Whom they set before the apostles: and when they had prayed, they laid their hands on them."
Acts 6 is very telling. The Greek widows complained against the Hebrews (
DIVERSITY), because they weren't getting enough fo the poor fund (
EQUITY), so the apostles appointed 7 deacons to deal with the problem, ALL OF WHOM HAD GREEK NAMES! (
INCLUSION). This attack on diversity is actually an attack on Jesus.