To support his statements, he refers to Kieran Healy, a Professor at Duke who works in a completely different area of sociology, but doesn’t hesitate to butcher statistics to reach the conclusion he wants. He produced this pair of charts, showing the occurrence of assault victims for the US vs. the other OECD nations, and for different regions of the US.
Since you’re smarter than Professor Healy, you’re undoubtedly wondering why he picked deaths to indicate violence, rather than number of assaults. You may also be wondering why he picked victims instead of offenders. Finally you may wonder, after reading through his posts, why he found it difficult to break out deaths due to firearms from all assault deaths, when the data is readily available via the FBI.