Wow. 4 crew members in the same set of crew. None of them said "no, wait a minute, we cant do this...". All 4 continued drinking and all 4 were willing to show up for work.
Then it might be a problem with the company culture about saying "no" and reporting.
I crew member under influence is bad enough, imagine both pilots and half the cabin crew. That is a different level of danger to safety for that flight.
