Is a decrease in crime really a valid counterpoint to an increase in depressed, overweight, and suicidal kids? On one hand you have maybe time served in juvy with a chance to straighten out and learn life lessons, or possibly become a career criminal. On the other hand you have an obese recluse with a chance of suicide or long-term depression.

edit: To add to that, of course crime is down - kids are driving later, going out less, having less sex. There are less opportunities for crime, unless you count underage sexting. So if you view more time spent in front of a screen preferable to a decrease in misdemeanor loitering, you'd have a point.