I spent some time in Italy, and as an American, living in a town that has a $250 open container ticket law, was amazing that I could buy alcohol from streetcarts and drink it in the middle of the day walking down the street.
Something I noticed about my time in Europe: people drank all day; every restaurant I went to went out of their way to serve us alcohol, but at the same time, I never ran into drunk assholes. In an American city at 1:00 A.M., you can hear the drunk dicks shouting rude things at passing women, but I despite drinking all day, I didn't seem to see this in Rome.
From my impressions, it seems like alcohol in Europe is more ever-present (I was traveling with a Muslim who didn't drink, and the Italian waiters didn't seem to accept that, and brought him alcohol-laced drinks anyways - I would hate to be an addict and have to deal with that while traveling) but at the same time it's far more moderated and mentally healthy. Americans binge-drink, Europeans are more constant and moderate.
I know this forum has both Americans and Europeans, so I would love to hear what you all think about the Alcohol attitudes between the two continents.