I don't mind the uber-wealthy getting taxed heavily either, but in Japan's case I really think it is at the point of diminishing returns. Japan has one of the highest tax rates in the world, with the income tax, local tax, special disaster relief tax, and of course the consumption tax (not to mention the nickle-and-dime fees and surcharges for things like "proof of registration of inkan" etc...).
The rich can afford all of this, but the rich can also afford to find loopholes and weasel out of some of these taxes, or in the worst case they can find a safe haven to claim residency of, and get out of some of Japan's taxes altogether. The middle-class can't bear much more, and investors aren't going to be impressed with even higher corporate tax burden.
I don't know what the answer is. At least in Japan you get relatively crime-free cities, drinkable water, and national health care. But I feel Japan has reached the limits of its neglect of the macro economy. The disaster relief tax was a bitter pill, but everyone felt that some extraordinary measure was necessary to help Tohoku. I didn't realize it was in place until 2037. The government will need to get creative, or give up on a bigger military budget.