maat:
I don’t know the answer to this; perhaps one of my fellow PPRuNers does:
How many airline incidents and accidents have occurred in the last five years where alcohol was a contributing factor?
How many airline incidents and accidents have occurred in the last five years where crew fatigue was a contributing factor?
Who knows? But, I suspect you believe the latter is much more common. I would say: of course it is, for obvious reasons.
I flew fatiqued many times. I never flew under the influence of booze, drugs, or weed. I suspect my experience is shared by almost every professional pilot.