LSUTigerGirl,
The most "practical" argument against dry housing is thus:
Many schools are in small towns and rural areas in the middle of nowhere. In a lot of these, there are few or no student friendly bars in town, or sometimes the town itself is completely dry. There is usually no taxi service to speak of or other mass transit. In places like these, fraternity parties are often the only social game in town for ANY students. To hold an event with a 3rd party vendor, students would have to drive long distances (I'm talking 30+ miles) to get to anyplace that would accomodate a large party. Even with using designated drivers, there is still the risk of tired students driving on roads that are often poorly marked and maintained.
The nationals all maintain that the dry housing rules are not there to create prohibition, but in situations like I've described, that is often what happens out of necessity. That's why everyone is so up in arms about it.
There are other reasons in the dry housing threads on here. Believe me you don't know how lucky you are to be in a big city with New Orleans just a little down the road!!