Actually, i'am against high(er) income tax. in contrary, i' am agree with libertarians which say income should be completely tax free. But in my opinion, there should be a higher tax for gains on stocks larger than, let's say, 1 mln. The most rich people had worked hard to get rich but then they get richer just for letting there money work.
Some countries or states don't have any income tax at all and rely on sales taxes. I think this is a much fairer system and doesn't penalise anyone who has worked hard for their money. Luxury goods should then have a very high tax whereas basic food and health staples should have no tax and then intermediary stuff other than the basics has a middle tax rate.