Typical American business. They would rather go bankrupt than put in the effort needed to meet high production quality standards. No matter what happens the GT executives make millions, so what do they care?
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I agree with your sentiment but Apple has no expertise in Sapphire manufacture. If they bought GT they would be trying to meet production standards with the same set of managers and engineers who failed this time. It would be a boondoggle that wouldn't be assured of saving any jobs at all.
What I'd really like to see Apple do is move production of their own products back to the US. Start with low volume computers - they've already done it with the Mac Pro so move on to other desktops and then laptops.
Moveing iPhone production to the US would be a decade long undertaking. Not likely IMO, but damn it would be nice to see the US economy heat up with every iPhone release.