Surely in this day and age, with all the technological advances in aircraft and the operation thereof, it's not too far fetched to impliment a system that stops the folks controlling these fantastic machines from being off their trolleys on fermented vegetable matter whilst in the cockpit ?
i.e. compulsory breath tests for every pilot before every flight.
It takes seconds to perform and would eradicate all risk of any pilot taking control whilst over the limit, and all the associated "tell or don't tell" moral wrangling.
There can be no justifiable argument against this.