This will change soon in Europe with the muzzie takeover. Wonder what the rate of rape among muzzies in Europe is, compared to U.S. rate.
Then, too, the US has an overarching cultural impetus to FORCE TOTAL ASSIMILATION within 2 generations.
Now, back to the question of comparable murder rates by ethnicity, it is possible to build a proxy for European ethnic groups out of American cities or counties with a population background pretty well tied to a single European country or area. Minnesota is a good match for Sweden. The Upper Peninsula of Michigan is a good match for Finland.
If you do that you'll find that Americans of any specific European ethnicity have a lower murder rate than their far more blood thirsty European cousins.
The same for African Americans ~ their murder rate, in the aggregate, is incredibly different than the murder rates in any predominantly black African nation!
Then there's WWI and WWII ~ you add those two events into the statistical mix for the last century the United States shows up as the most peaceful nation on the planet!
I believe 100% of rapes in Norway in the past five years have been by Muslims