The taxes themselves were never the issue. The costs associated with the taxes were.
If the taxes aren't an issue then why does every GOP candidate want to lower them even further?
I believe the GOP wants to lower the corporate tax rate and get rid of loopholes at the same time. In effect making it more appealing to companies to operate within the US since they don't have to hire lobbyists and the associated lawyers and tax accountants to get the best possible corporate tax rate money can buy. There is a reason why the Democrats oppose such measures. It's because a lot of lawyers and tax accountants will be looking for employment! But no one ever said that a nation could prosper on the backs of ambulance chasers and pencil pushers.