It is staggering in its spin. Violent crimes in the U.S., along with some European countries, and Canada, Australia and New Zealand, have a characteristic that they do not have in Asian countries and those republics that used to form the U.S.S.R. (Georgia, Belaruse, Armenia, etc) not to mention the Middle Eastern countries and African nations don't have: accurate reportage.
The murder and other violent crime rate in South Africa, for example, is so high that it cannot be kept up with to any degree of accuracy.
In China the murder rate is just plain lied about by the government controlled news media.
Characterizing the U.S. as things like, "the most violent society on Earth" is absurd, on a present day basis and on a historical one. Even a quick skimming of what's going on around the world bears that out.