I think the problem lies in the lack of consistency in the regulations, and some very difficult regs.
A zero tolerance reg is in my opinion both unecessary, and practically very difficult to comply with safely. What is needed is an evidence based and universally adopted blood alcohol level, which all can accept.
Consumption of alcohol, (particularly red wine) has numerous health benefits, including : reduction in stroke, heart disease and certain cancers. It is therefore important that individuals in any walk of life should not be denied the choice of taking alcohol in moderation. If we accept that, then zero tolerance is unfair.
The airline industry should take the lead in supporting research into the appropriate maximum levels of alcohol above which performance is significantly impaired. I'm certain there would be plenty of volunteers.
There is some, (not very good) evidence about fatigue and psycho-motor performance, and this is at least as important as blood alcohol.
I do not condone reckless excessive late night binge drinking, but I think there should be a consistent, fair and sensible approach to the problem rather than a blanket ban, which can reck pilots' lives unecessarily.
Let us all hope that the crew involved are innocent.