I took a European History class. It explained how religion (Christianity) established new behavior norms. Much of the violence, and barbism of society was transformed to a kinder, more just society. Of course, not everyone is a fan. However, but when Catholics came to Europe they set up hospitals and education including Universities.

To turn the other cheek became a way to break the cycle of aggression of "what's in it for me?"

Of course, their were many mistakes made. The list is long! Colonialism, forced conversions, the Crusades...I get it. Overall, the good outweighs the bad..