The real problem with underage drinking is the lack of self-control exhibited by the current crop of low-life scum ... sorry ... future valuable members of society

.
When I was a young 'teen, in aeons lost back in the swirling mists of time, of course I used to have a drink but it was the odd glass of wine at weddings or a half of shandy whilst sitting with dad at the sea-front.
Away from parental supervision, more used to get consumed (as rebellion in teenagers is not something new

) but thankfully bitter tastes pretty foul to tastebuds still attuned to sweet things (as do a lot of spirits) and thus getting falling over drunk was never a likely event.
Plus, it was actually seen as monumentally 'uncool' by the girls to be in such a state - so, despite the male peer-pressure of drinking being 'manly', there was a countervailing pressure to stay sober as there was more chance of a lass actually taking an interest.
Nowadays, it seems that 'teens hang-out around off-licences trying to badger the proprietors into selling them alcohol or getting an older 'friend' to get it for them. After they've had their half-bottle of Lambrinni they then stand at street-corners in 'hoodies' generally making a nuisance of themselves until the Police patrol by ...then it's off into the bushes to make some more teenage single-mothers

.
I'm afraid that I sound less than liberal or understanding on this point ... and that's because I'm not, having seen far too much of what happens when young people (who have no discipline to start with) let down the barriers even further by artificial means.
Like the poor kid, about 16 or so, I had to keep watch over in the street until the Police arrived and the ambulance came to take his body away because he'd drunkenly staggered out into the road (in his 'hoodie' of course) and got splashed by a car. I know it's an extreme example but it's solidified my feelings on this matter. Being dead is never cool (not even for Goths).