I know this is contrary to socialist thinking, but have you ever considered that we need more rich folks, not fewer? And that we should be encouraging them to earn more, not demonizing them?
It is raw capitalism that is exclusive and leads to fewer and fewer rich people who are more and more rich. This is because as you become wealthy it becomes easier to earn more money. It should be much easier to earn your first 100k and much harder to earn your second million.
As with all natural systems there needs to be a rule of diminishing returns.
This idea that too many taxes will stunt the ambition of the super wealthy is a red herring even if it were true. It is the stymied ambitions and abilities of the millions of subsistence wage earners that you should worry about. You shouldn't be encouraging the wealthy to be more wealthy but rather encouraging the poor to be rich.
Would you say that taxing $1k from a guy who earned $10k is the same as taxing $100k from a guy who earned a million? Are those equal burdens? Why put the burden on those who are least able to bear it?