Here's a great and relevant TEDx talk by Chuck Collins at Hampshire College - clearly timely in light of the Occupy Wall Street movement and the raging tax-cut debates in Congress - about his work to support the inheritance tax with Bill Gates (senior).
"We're nothing without each other" - an elegant way of noting that we are an inherently social species, and when the social fabric is systematically undermined, it's unsustainable. We're all connected and no one acts in complete isolation. Taxes have been demonized over the past 3 decades since Milton Friedman's free-market fundamentalism took hold of our economic thinking, and this video makes a compelling case for why that's bad for America and global society.
For more millionaires who agree with this point of view - see this interview about "Patriotic Millionaires"