I think you're wrong on both points. I've heard plenty of rich people say they believe their tax rate should be higher including some of the ones on that list. You're also wrong when you say it works. It works for who? If you don't attack the spending problem it's just more money to be wasted. Let's face it the political system is outstanding and finding some need to spend every cent they can possibly get their hands on. It won't matter if they spend it on your priorities or someone else's they will always find the need to spend it. In our current inflation based economy they don't even need to spend what they take in it's easier to just print more and that's exactly what they're doing.
The rich saying their tax rate should be higher only advocate for higher income tax rates, which they are already avoiding for the most part. It's just another PR stunt.
Billionaires. Does that narrow it down enough for you? By far they advocate for policies that let them keep billions in wealth and get even more on top of that.
As a group I suspect you’re right but I really question why we have a tax system that is so accommodating to their requests. It’s money in politics. I’m pretty clear about that one.