@ToddL I couldn't agree more and was going to comment on the booze too, but didn't want to stray too far off topic. The heart of the problem, as I see it, isn't the inexperience, the idiocy, or even the drinking in and of itself. It is the mentality that boating is just another gateway to getting wasted. The people in question are not boaters and therefore they take no interest in becoming responsible or good drivers. They are partiers first and boaters a very distant second. It's gotten dramatically worse in recent years too - all you have to do is look at what types of boats are selling the best. Deck boats and pontoons are all people want. I'd hate to see things get to the point that nobody could enjoy a cold beer on a boat, but quite honestly an all-out ban wouldn't affect me because I don't drink anymore. It would also weed out those who don't have a passion for the water and are just using it as another means to binge drink.
Your comment about them not thinking a trip to the lake is complete without open containers is right on. Since when was going skiing or just for a boat ride not good enough, and not enough fun? You can get plowed in your living room a helluva lot cheaper.