To airline managers regulation limits are targets. They will push pilots knowing smugly that the pilot bears all the risk
And while this dichotomy exists there can be no real progress in the area of safety with regards to fatigue management. As I have stated elsewhere, it really should be a joint responsibility but in reality it isn't. There is something about this that is ethically and morally wrong and yet entirely 'acceptable.'
Aviation managers can tell pilots 'don't fly fatigued' until they are blue in the face and yet at the same time they spend their efforts lobbying for regulation framework and structures that endeavour to extract 'maximum efficiency' (one could also read that as 'burn them out'). For all this effort, when something goes wrong, essentially they get to wash their hands of innocent blood (like Pilate of old) and walk away...