Concepts like "judgement impairing" and "brain altering" just aren't getting through to you are they? It doesn't matter how much I trust the person, regardless of age, when they are sober. When under the influence of alcohol, they will not act the same way they would have when sober. That doesn't matter, your still not trusting them to drink responsibly. This part of the argument has nothing to do with the effects. It's the principle, your assuming people will not drink responsibly. Then at the same time assuming the same people will handle a career in killing people responsibly. These effects are not always harmful, they are not always judgement impairing to a huge degree, or even a slight degree. In my opinion, age doesn't matter when it comes to drinking. It's about responsibility and maturity of the person. Hypothetically, you can give a beer to a drug attic at age 21, but you can't give one to a 16 year old kid who has outstanding grades, and is a boyscout. Odd, isn't it?