How many airline incidents and accidents have occurred in the last five years where alcohol was a contributing factor?
I suspect very few. Whereas there may well be an attempt by other crew members to 'help' a colleague to avoid the sack - and my lips are sealed - this wouldn't be carried out to the extreme of allowing oneself to be killed.
One supposes.
By comparison I know of incidents where a supposedly sober pilot ( no suspicion of it being otherwise, but then how would we know ? ) committed suicide, and the murder of many people, by engaging in action that destroyed his aircraft.