etrang
Drink driving is a crime too, however it is obvious that it's the vehicals that do the physical damage even though the alcohol (+ stupidity) is the cause, as everyday there are accidents that do not involve alcohol, would you therefore also propose a ban on cars, trucks etc?
The fact is no one forces you to drink on an aircraft. If you choose to do so to excess, then you must take the penalty. Personaly I believe that that judge in the USA a few months back had the right idea, adding a requirement to compensate the airline for diversion costs and other pax for inconvenience to the ruling, should add the policing cost too.
Knee jerk laws / rules that make the well behaved majority suffer for the misdeeds of the many are what cause contempt for the law.