Stick to business and stay out of trying to be a folk hero? Or pay higher tax rates voluntarily to set an example? Campaigning for a tax increase when a lot of his money came from helping people use a tax loophole created by his industry doesn't seem particularly righteous.
As a businessman, he's required to exploit these loopholes, much like a lawyer is required to defend a client they know to be in the wrong. What makes Buffett special is that he, unlike so many other super rich, is choosing to publicly draw attention to the system they all know to be broken.
http://www.taxpolicycenter.org/publications/url.cfm?ID=90058...