Russia is a different mind set & culture. Even including them I can not think of 1 accident that was put solely down to being drunk. Whatever it is a minuscule %.
When I 1st started commercial flying it was not un usual for capt to have drink on the last leg. "Just a sharpener old boy". We were not crashing in those days either.
However Drinking & Flying is a no no as it rather leaves the interpretation of how much open.
In my experience those caught if not alcoholics are those that misjudge the time for alcohol to clear the system. They don't purposely set out to drink & fly. & indeed probably would operate just fine. So if I smelt alcohol on a colleagues breath I would insist they went sick. & that would be an end to it, but should it happen again then the report would go in. Surely that is the human thing to do. Without compromising flight safety.