For those with an interest in moral philosophy, note that Gandhi said "Wealth without work" is one of the 7 DEADLY SOCIAL Sins. I think Buffett advocates taxing income from wealth at the same rate as income from work. In my humble opinion, this is only fair, & consistent with Gandhi's philosophy.
For those interested in Christian theology, consider God's revelation of his social wisdom to the OT prophets, i.e.in peaceful & just societies, ALL citizens will flourish. Faith in God's social wisdom, is reaffirmed by the Gospel of Luke, which characterizes Jesus as a "true prophet", who brings Good News to the poor. According to Nicholas Wolterstorff in "Justice", Buffett & Obama seek economic justice, so that ALL may flourish. This is not "Class Warfare', according to Yale Law Professors, Bruce Ackerman & Anne Alstott, in the Huffington Post.
In short, I trust the wisdom of Warren Buffett.