I would imagine you're clever enough to think this is silly logic too? I mean we all push so hard for them to stick to so many of Walt's visions (You're dead if you only aim at kids) that we can't use the "oh they don't care anyway so why not get rid of all of them" excuse, but only if we don't care about his other visions and I think this thread alone proves we do.
I'm not against alcohol in the parks, I just don't think thats the best reasoning against it. I mean, it's better just to say that times have changed and the attitudes towards alcohol with it. Paris does it fine, they tried banning it but culture is different and when you pay so much for a meal you expect to be able to accompany it with a nce glass of wine. If the parks did introduce the likeliness of roaming drunks is small, I've paid enough to get in and the drinks are more expensive than a swanky night club would charge so I'd rather got there to get drunk than a Disney park, where I might as well enjoy my time, and enjoy my meal with that glass of red it deserves (some places).