I admit to nothing!
I'm not trying to purposefully ignore any information. Maybe (probably) I'm not being clear.
Gang membership, in the US, is predominately Hispanic (50% Hispanic, 10% white). Yet when it comes to homicides, there are 3x more white victims (and perpetrators) than Hispanic.
If gang membership had a huge influence on homicides, I would expect Hispanics to be represented much more than they currently are in homicide figures.