Paula - as you probably gather by now, this is an industry wide problem, and the ultimate blame lies at the feet of the legislators who approve insane roster practices. Profit is the ultimate driver after that. Whatever is 'legal', no matter how fatiguing, becomes the standard. What used to be ultimate LIMITS set by aviation authorities have now been transformed into TARGETS. In other words, pilots are regularly worked to the extreme limits of the law and that is the mission of almost all rostering departments.
The only constraint on such practices is a good pilots union who can enforce some sanity. The Cathay pilots here have such a Union. Yet they feel over worked too. Pity those who work in a totally Union free airline, where anything goes.
As long as it's 'legal' of course!