Whatever Warren Buffett says, whatever position he takes, we can rest assured that it is calculated to benefit his bottom line in some way,
Here's a brutal takedown ol' saintly grandpa Warren:http://techcrunch.com/2012/05/12/warren-buffett-is-a-punk/
But it's actually worse than the article suggests.
Buffett actively campaigns for the perpetuation of the estate tax, then he seeks out family-owned businesses that the estate tax is forcing the family to sell (because the value of the business for estate purposes is far more than the family has cash on hand), and he offers a price between the amount of the tax and the value of the business, so he gets a boost in his balance sheet instantly, while the family takes a loss.
He is just flat-out evil.