Drinking before flight

So through Youtube I was watching some Airline episodes. One of the most recurring incidents on the show was the "you can't board because you are drunk" scene. Countless episodes would show someone being denied boarding as they were too drunk or drunk enough that Southwest felt they would be a threat or safety issue.

Maybe its because I am not a drinker but it just seems foolish to go drinking excessively or at all on the day you are to fly out. It sounds as silly as people who are upset over No smoking legislation in restaurants, those upset over it are silly because you must be addicted if you can't go a few simple hours without alcohol or cigs.

It just seems silly to drink when you know you are getting on board a flight.