"The kerfluffle over Apple's Irish tax bill is because the EU competitiveness committee has ruled that Ireland's low taxes are equivalent to an unfair subsidy. But the key point is that it is Ireland's rate, which is why Ireland is also fighting the EU ruling. If they can't have lower-than-average business tax rates, they might have a harder-than-average time attracting businesses."
Ireland made a deal with Apple, whereby Apple effectively paid NO tax (vs the standard Irish rate of 12.5 or 13%). THAT is the problem - that Apple scored a preferential one-off deal that is not available to most other business operating in Ireland.