All the news you received about street gangs in today time haven't change much (except social media/Internet) since 113 years ago when Italian gangs was in the ghetto. Mafioso have been doing drive-bys since prohibition. Presently the violence you hear/read about is over various reasons. Also, you have to remember that juveniles make up a good chunk of membership. You ever heard the saying "young,dumb, and full of cum"?