We've all seen The Corporation, right?
Stakeholder responsibility and social awareness are not allowed to come into the tax-decision making of a publicly listed company: they are mandated to do whatever makes the most money for the shareholders. If they didn't use all available tax loopholes, they'd get sued.
So GoogAmazApple are right to tell Parliament / Congress that if they have to change the rules if they want to stop loopholes getting exploited. Trouble is, then their mates at the banks can't use the loopholes either, so it's unlikely to happen.