.........heard a fact on the tube a day or so ago. It was that currently, when you include all the cities you named, the U.S. is in approximately the top 3 most dangerous places in the world as far as murder rate is concerned.
When you take out all the cities you named, and their murders, the U.S. is about the safest country in the world to live in!
The USA is about 110th from the top in terms of murder rate, even with our big cities thrown in. USA is below the world average for murder rate.
http://crimepreventionresearchcenter.org/2014/03/comparing-murder-rates-across-countries/
You’ll find corroborating data on Wikipedia.