As far as parents who say "my child would never", that belief will probably be shattered when they see photos and/or videos of their kid behaving badly. Seeing is believing, and usually the best/only way to get people to believe sometimes.
At least that little thief got caught. Many store chains let the customers steal and do nothing about it. In fact, employees of those store chains who attempt to confront/stop shoplifters get fired for doing so.
Parents should teach their kids self-restraint and discipline so we don't have to waste taxpayer dollars teaching it in prison. It costs between $20,000 and $100,000 per year to keep someone behind bars, depending on the state.