"1. Kids have little or no slack in their schedule. This means very little freedom, and very little time to work things out mentally. School, practice, volunteer, homework, bed, do it all again. This builds up to a very difficult to unwind ball of stress, anger, fear and despair."

By "kids" you mean upper middle class suburban kids. Working class kids aren't overscheduled in this way. The bulk of kids in the US don't live the life you describe, and for the most part are under supervised. Your anecdotal information is tainted by the bubble you live in.