"people who's primary source of earned income is the sale of transportation of illegal substances"

Usually this group shows up in stats as "gang related crime" or something like that.

Basically it's all the violence that lawful businesses don't need to use to settle business disputes because they can use the courts and threat of state violence to settle their disputes instead whereas the drug industry needs to bring it in-house.

It's a correlation with poverty and gangs. If you take out gang on gang and suicide, assumung neither is relevant to you, it's true that the numbers become much better.