Even though alcohol use by teenagers is down compared to our generation in Australia there are some good ideas here:
At 1:08 "it became illegal for teenagers to be outside at night" is a totally insane way to get them to stay in.
And no mention of the GFC sending Iceland broke....no spare money means no partying.
We've known this since the 70s: en.wikipedia.org/wiki/Rat_Park
That somewhat infamous "rat given an unlimited supply of drugs" experiment that saw the rat eventually dose itself to death was done with the lone rat in a cage with nothing else to do.
The same experiment done in a cage with other rats, toys and the like saw completely different results.
It's the environment.