The US didn't expend resources helping them make that money, therefore it doesn't deserve any of it. If anything, we should be encouraging them to bring it back here.
Also, I know people who live and work in foreign countries and haven't stepped foot in the US for decades who still pay tens if not hundreds of thousands of dollars to the US each year in taxes. So yeah, it's unfair that large, American corporations are somehow exempt.
I'm as tax-phobic as any red-blooded yank, but if we are going to demand ever increasing government services and entitlements (including corporate welfare), we better be willing to pay for it.
You said it.
Why would you source Apple's effective tax rate at http://www.advfn.com/ and not point out that on the same website, Google's effective tax rate is 21.4% and not 2.4%?