Well, the issue that so many Slashdotters are up in arms about is a very relevant issue to the tech industry in America. You say that there is no legitimate reason to tax, but what everyone is arguing is that the business IS done here, but accounting witchcraft makes it seem like it's not.
Now, there are plenty of legitimate arguments about certain topics such as the iPhone which is manufactured elsewhere, but the reality is is that there are a lot of American corporations who pay little to no taxes while making tons of money while benefiting from the American government. Many shades of gray? Yes. Feds wanting to tax something that they don't have a legitimate reason tax? Actually not so gray; there are legitimate problems with the tax system that the feds feel like they need to clamp down on.
Now, don't take what I say to be an approval for high taxes or in fact taxes at all; what I'm saying is that you are dismissing the argument of tax loopholes as invalid when in fact there are serious problems that could be solved and simplified for the greater benefit of both American corporations and the American society.