As previously stated, companies will work the crews right to the legal limit. They are not sitting around thinking about how to make things better from a fatigue perspective for their staff. They are trying to maximise dollars so people can a) keep their jobs then b) turn a profit for shareholders.
The problem is the regulator + the industry culture. I love these "audits" that get done that uncover absolutely nothing time and time again. Suggest having a read of the Colgan Air crash in the states where fatigue/standards/employment conditions are getting a fair spotlight at the moment.
There is no point in pointing fingers at management. Its EBA (if you get to negotiate one) and regulator. Other than that if its legal there is nothing you can do (apart from leave).
Eventually this problem will get sorted with a hull loss - it came so close with the EK mishap in MEL.