In addition to all of the above, there is also the material reality. You'll have to look hard to find a teen who doesn't wear brand-name clothing, shoes, or doesn't have a cell phone, computer, MP3 player, palm. When they get older, they'll want a sports car, a 54-inch TV, and so on. The list goes on. It's a consuming world, so people need money. If they steal a motor bike (sorry Tara), it will finance their luxurious taste.
Fifty years ago people are happy with a radio at home, a TV was a luxury. People read books and chat with the neighbours in their spare time. Today a lot of people don't even know their neighbours.
This, I am sorry to say, is evolution of urban life. Where does it lead to? Nobody knows.