I wonder how many countries have the mass, diverse, integrated society the US does? England comes close, but others are mostly are one race. The complexity of relationships between whites, blacks, other races and ethnicities cause great stress upon those who don’t have the basics of life ingrained in a good family life. - just saying...
European Murder Rates Comparted to the United States:
http://gunwatch.blogspot.com/2013/01/european-murder-rates-compared-to.html