Feeling punchy

Client is a freshman in high school. He's on probation for having brought marijuana and a bong to school when he was in the 8th grade. Apparently he got mad and punched a wall in the house, and his mom called the cops. The cops said they were going to arrest him but couldn't because their computers were down.

If he really deserved to be arrested, is it a good idea for the cops to avoid arresting him because they don't want to fill out paperwork?

Is it a good idea to arrest a 15-year-old who punches a wall at home?