The more people interact in a positive and non-aggressive way, the more societies will be able to flourish and grow. This positively affects everyone involved and helps one particular society to experience areas and times of growth and prosperity.
Explanation:
If people from many cultures integrate with one and other then the potential is there to improve their knowledge and worldview. By connecting with people from other ethnicities/cultures and by supporting their beliefs and views it is apparent to avoid prejudices.
"The Great Schism of 1054" / "East to West Schism" was the final speration of the eastern and western churches. (Protestant vs. Catholic) People broke away from the Catholic church for the first time NOT afraid of consequence.