That would be the case if Apple only used those tax cuts to do business inside Ireland. But Apple used those cuts, sold products all over EU and then tried to

That would be the case if Apple only used those tax cuts to do business inside Ireland. But Apple used those cuts, sold products all over EU and then tried to pay (or actually not pay) their due taxes to all those EU countries where it did business back in Ireland. Apple was not trying to use the Irish law, Apple was trying to use a loophole in EU that didn't actually existed and got caught.