[quickConclusion]

Gates and Buffet want to raise the capital gain taxes, democrat multimillionaires like B. Sanders and E. Warren are in favor of taxes. That's only for the most famous. There are a lot of rich people, less famous, concerned about inequality and favoring something not in their personal interest.

So on one hand I disagree with your "hard to find 100 Hanauer" point, but it does not mean your bigger point is wrong, just that it may not come simply from their job, but maybe education/social environment.