Some very noble sentiments have been posted here, boiling down to saying we should have the courage to say no to flying when we consider ourselves fatigued.
I agree with those sentiments - unfortunately they do not reflect the world in which we operate. The reality is that in any airline there are a few pilots willing to put their heads above the parapet but the majority prefer to do as they are told, albeit whinging in the crewroom, on the flightdeck and on the internet. Management knows this all too well so the "troublemakers" are swiftly identified and made to leave by one means or another. Ours is a small profession in which news travels fast, so a pilot who has left an airline under such circumstances will have the greatest difficulty finding another job. This serves as a salutary warning to the rest of the pilot force.
The solution should be sensible limitations imposed by the national and international authorities. Sadly, crews are always outgunned by vested interests when represented at the meetings where such things are discussed. I've lost count of the meetings which I have attended where BALPA or whoever have been politely listened to and then marginalised by the big battalions of the operators who invariably get their way by dint of having more votes. UK CAA is aware of the problem but its hands are tied by the requirement to be "responsive to industry".
In my view, the problem will only be solved when we achieve critical mass - in other words, many more pilots being ready to say no to dangerous rostering. Whether this can be achieved, I just don't know, as it requires a sea-change of attitude amongst the pilot community as a whole. It takes a certain courage to put your job on the line when there is the mortgage etc to be paid.
confundemus