It is not a criminal act to refuse to commit a crime. This strikes me as you misreading what I wrote. If the 20 year old refuses to purchase alcohol, he has not committed a criminal act. A person who solicits a 20 year old to purchase alcohol has solicited the 20 year old to commit a crime. It is a crime because the legislature has duly passed a law making it a crime and has the authority to do so.
The is probably the key to your misunderstanding. The crime is asking the 20 year old to buy alcohol. The fact that you might also require the 20 year old to purchase other items is totally irrelevant. Your claim that you didn’t need anyone to rob a liquor store is irrelevant and if more fully developed would amount to a straw man. While the act of buying alcohol is legal for many people, it is not legal for anyone under 21. You seem to have more than just a philosophical disagreement over whether this law is wise, you have attempted to coerce someone to commit a crime in your protest and deem and employee “untrustworthy” for refusing your solicitation of a crime. As almost a side note, your emphasized use of “almost” is also disputable. Over a quarter of the population is 20 and younger. Demographics of the United States - Wikipedia
You seem to be arguing here that just because some jurisdictions have the age of consent at 18, it should be the same to purchase alcohol. My jurisdiction has the age of consent at 18. And alcohol 21. You seem to be arguing that these are equivalents. They are not. Alcohol is an intoxicant and not a human right. Sex is not an intoxicant, and a human right for adults. People who engage in sex are not at a higher risk of driving dangerously after having had sex, with or without other people in the car.
If for your purposes the only reasons not to hire a 20 year old are booze and car rentals, well so be it. But it has nothing to do with the general trustworthiness of a person who refuses to break a law. I would trust this 20 year old over you in any matter concerning honesty or integrity because he refused to break the law that you commanded, and you blame him for it and cannot even see that from the point of view of the law abiding public that you have committed a crime and would do so again if it were in any way convenient for you. Soliciting crime in others is not a small matter, but goes to the heart of moral turpitude because it corrupts others.
I think you need to re-read what you wrote. I understood your OP to cast the aspersion of untrustworthiness on the 20 year old because he refused your criminal solicitation. Perhaps you did not intend to communicate that, but it is a reasonable interpretation of your original OP and your follow up posts.
Don’t be obtuse. The brain of a human being does not fully form its judgment abilities. http://www.academic.marist.edu/mwwatch/fall05/science1.htm Alcohol further impairs already impaired judgment. They drink alcohol and drink it to excess and are likely to supply it to other teenagers (and I’m including 20 year olds in the general term teenager here, despite the fact that the word does not end with “teen”). It is an intoxicant that can and does cause brain damage and death at higher rates in the very young because of this worsened and compounded misjudgment. http://www.academic.marist.edu/mwwatch/fall05/science1.htm
Yes, they will have fewer job opportunities below the age of 21 due to people sharing your views. Only a very small handful of legislators, out of the thousands in the US have ever offered bills to allow minors to handle liquor. You are the very first to come up with an argument that these liquor laws not only make them less hireable (which they do), but that it reflects on their trustworthiness as employees.
Had you not developed the idea so adroitly over the thread I would have attributed your opinions to misunderstandings of words like “trustworthy”. But it comes off as your contempt for people wanting to comply with the law you think is stupid when it would be more convenient for you that they violated laws.
Could you trust a 20 yr old with a fake ID, as long as he could buy the booze?