Actually, things aren't nearly so black and white.
Beer can be 5%-8% ethanol or so.
Weak beer can be 3.5%
Sweet cider from Normandy can be 2.5%
That fruit salad that you prepared at 5PM before the guests arrived, and left on the kitchen counter, can be 2% by the time you serve dessert at 8:30.
A nice ripe peach, 1% or 2%.
Are you seriously going to claim that eating a peach renders one unfit to be a passenger on an airliner?
If no, then it isn't "black and white" at all, but, like all things in life, a matter of considerable nuance.