They are talking about gang violence, which severly skews the numbers because european countries don't have nearly as many street gangs or cartels. Those are the people commiting the vast majority of violence and they are also the people who wouldn't be affected by stricter gun laws.
I personally support strict gun laws, but if you look at states without gangs like
Vermont they have the
lowest per-capita homicide rate in the country, and
they also have one of the loosest set of gun laws. You
don't have to have a license or register your weapons yet for some reason they have the lowest homicide rate ... HMM I WONDER WHY, Is it maybe because there aren't street gangs roaming around killing each other? Or is it a quantum paradox?
Sources
Vermont gun laws -
https://en.wikipedia.org/wiki/Gun_laws_in_Vermont
Homicide by state -
https://en.wikipedia.org/wiki/Murder...tates_by_state