Timbo is right on this and I'll take it a step further. Pilots who fly those legs fatigued generally do so out of fear of a chief pilot rug dance or even perhaps getting fired. But if you are involved in an accident or even an FAA violation due to your fatigue, you will lose your license either by suspension or revocation. In either case, your career in aviation is over. Nobody else will ever hire you even if you get your license back after suspension.

Fired by Delta with your license still clean means many other opportunities as a pilot. No license or a tainted license means no more opportunities as a pilot.

Bottom line is that you can never ever compromise safety and your license by flying fatigued. Never. It's the worst career decision you can make.

Carl