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<p>I’m just speculating here, but I think the main problem with slightly-underage drinking as opposed to legal drinking is that underage drinking is more likely to occur in a “rebellious” context that encourages abuse. Adults usually drink at home or at relatively classy parties where getting wasted isn’t encouraged, but underage drinking is more likely to be kept “hidden” and I think some people fail to see the ethical distinction between the drinking by itself and, say, drunk driving. Because they’re both illegal, y’know?</p>