Look at the issues we see these days. Anger and depression. Kids NEED to get outside and blow off steam. Kids are socially inept.... "Playground Justice" used to be a fine way for kids to handle failure, insults and life, without Mom and or Dad there to protect them. It all taught kids to instinctively, handle emotions.
Ever notice how as the days of seeing kids outside decreased, the amount of drugged up kids increased?? It has bred a society of people who cannot "deal" with self control and life in general.