Companies are also not citizens, they are abstract structures designed to deliver value to customers and make a profit in doing so. A corporation has no specific loyalty to the government beyond following the laws and paying the dues required for operating. Corporations are also not able to judge what the "ethical" amount to pay is, which is why the government sets those rules on behalf of the people it represents.

You're turning a government issue into a corporate issue because it sounds easy, but ultimately its just treating (or rather complaining about) the symptom rather than enacting any solution. Again, perhaps you should join the government and enact the change you want to see?

Also since you are talking about responsibility and actions, I assume you donate all the spare cash you have that isn't going to taxes. Or is that not ethical in your case?