When discussing a topic like gang violence why would you focus on the general societal homicide rate unless gang homicide's execution mirrored that of the society at large? The only useful attribute of your approach seems to be that it downplays the severity of what's being measured at a glance. The ranked approach is also strange considering that the obvious point of interest for most people would be whether the gang related murder rates in the countries that accepted refugees trended upwards or downwards from their past values within those regions. Comparing countries to each other instead of comparing them against their historical selves is just sleight of hand to excuse real human suffering as "exaggerated".