Fjordman is Norwegian writer of jeremiads. Here is his reaction to book review in The New Yorker of God's Crucible, a book about a barbarian invasion. He is less sanguine about civilizing benefit of slavery. Below is except from his article.
Contrast this with modern times, when southeast Europe (the Balkans) is Europe's number one trouble spot. So is the original seat of the first Indian civilization, in Pakistan and Kashmir. The Greater Middle East thus went from being a global center of civilization to being a global center of anti-civilization. This change largely coincided with the Islamization of the region.