If they were unruly, then charge them as such. Why bring the intoxication side into it at all? Serving alcohol on a flight and then charging someone for consuming it smacks of the hypocrisy rife in the region. If you wanna play ball on the international court, you better be trained and ready to deal with a few players who play by international rules. If they break the rules, then get them for their misdemeanours, not for what you served them.