Never openly contradict another professional on an open frequency.
WHAT! Just sit back and watch as ###pax depart for their final flight!?!
It's this type of 3 monkeys attitude that CRM is supposed to prevent. Your responsibility, even as a fellow human being, does not end at your a/c door. If you see something you believe to be wrong, report it. Even if the other crew dismiss it as spurious, but you still have doubts, report it again.
Reminds me of a couple of years ago, was taxiing behind a 732 which had just pushed back when we noticed liquid leaking from the #2 engine. Upon reporting it the crew replied
"it always does that". I again repeated to them my concerns & suggested they have someone look at it. Their F/O stuck his head out the window & 10 seconds later they requested return to stand. A/C was still there the following day.
Never take anything for granted.
The
'we've always done it that way' attitude will only lead to one place.