I choose to not create a correlation of relativism between weed and beer. The illegality of one does not beget the benefits of the other, and vice versa. I've been known to partake in both, and think most people would agree if one is worse for society, it would be alcohol; but that doesn't make a cogent argument to me that alcohol or weed should therefore be more prolific.
NIH says 24.6% of kids 14-15 years-old have had a drink of alcohol. They also say people who drink their first drink before age 15 are 5.6x more likely to develop alcohol dependency later in life than those who wait until they're 21.
I personally take a Libertarian-type view where I'd loosen restrictions but strengthen penalties for alcohol-related offenses. Basically, if one is truly responsible, then let them be responsible. But if I give you a long enough rope and you hang yourself, then don't come crying to me for mercy. If you want to be treated like an adult, act like one.
For example, I'd put 10 year minimum mandatory sentences on drunk driving. I have ABSOLUTELY ZERO TOLERANCE for that. It's akin to firing a rifle into a crowd... any reasonable person knows the driver is going to hurt somebody eventually. It's a foreseeable event.
A drunk driver hit this young girl not far from my home and left her a double-amputee. He got drunk and tried to drive to the lake. He got two years in prison! As far as I'm concerned, he can get out of prison when she grows her legs back. He f'ed up... and with great freedoms come great responsibilities (and thus consequences).
I also had a family member die of liver failure from chronic alcoholism and it's a horrible way to go. The doctors told him if he kept drinking he'd die but he was too dependent and couldn't quit.
I'm not in any way anti-alcohol, there's plenty in my kitchen right now, but for the life of me I can't justify making it even more acceptable and available to children and young adults that just a few months earlier needed mom's permission to get out of gym class. I just don't see the positives outweighing the negatives. But that's just me.