Outrage is perhaps not the right term. It's important to keep in mind that Apple, being a business, is doing exactly what the primary function of a business is

Outrage is perhaps not the right term. It's important to keep in mind that Apple, being a business, is doing exactly what the primary function of a business is - making money. Reducing tax burden is effectively making money they otherwise wouldn't have. So while as a consumer and citizen I'm happy that Apple is being held to account, I agree with your concern that not even Apple, having gone to such lengths to ensure that such an approach is ostensibly a legal and legitimate method of doing business, can effectively have the authority turn around and say "We change our mind, you owe us fourteen billion dollars." It creates much uncertainty in the legal and administrative processes. I would prefer to see them simply close the hole for future endeavours.