All I can offer is that it is different when you're on the other side of it.
Perhaps how you came to be amongst the wealthy is relevant. I'm not sure. If you're in an old rich family who've played "keep away" with the family's megamillions for the generations, maybe there is some implied moral obligation to pay a higher share of taxes. Also, a major distinction should be recognized between someone earning 600k a year and someone sitting on 600m. Both are in that top 1%, but enjoy fundamentally different lifestyles.
It's been my experience that the vast majority of independently wealthy Americans earned their own money during the course of their own lifetime. They worked hard enough and smart enough (and in most cases for a very long time) to become rich. Taxing them more heavily just feels improper. Those people feel, justifiably so, that they are being punished for having been successful.