The writer was(is) a prosecutor. These aren't hypothetical cases, these are actual things he experience and actual cases he tried. If it were a bunch of kids in a gang riding bikes to terrorize a neighborhood, I think he is probably the person most likely to be aware of that and the differences from his youth. I'm not sure you can challenge his authority on the matter and argue he just doesn't know whats really going on considering his position as part of the criminal justice system.