We don't need to imagine what Buffett would say, as he's said it many times before, for example:

"The question is what is fair when you have to raise multi-trillions to fund the United States of America," said Buffett. "[Raising taxes] will not change my behavior. I have paid all different kinds of rates and I've always been interested in making money. I believe this should be a defining issue. Debbie works just as hard as I do and she pays twice the rate I do." -- abcnews.go.com - Warren buffett and his secretary talk taxes

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And for myself, I see no reason why my investment gains, which I spend maybe a couple of hours/year on, should be taxed at lower rates than the money I *actually put in work* to earn. Taxes buy civilization. At least, when you have a government which can agree that it *wants* civilization and is willing to fund it.