I believe some of Ray Madoff's points are that the tax code and most tax intuitions kinda differ.

There's the idea that "wealth" gains tend to not be taxed for a variety of reasons. The common parlance of "Buy, Borrow, Die" category things. The "step-up in basis" category things - i.e. no capital gains tax realized on lots of inherited wealth. (The inheritance tax might trigger in some cases, but oddly the capital gains tax often might not be triggered on transferred assets because they were never sold and the new possessor will be taxed at the stepped up received value if they ever sell. So there's a chunk of appreciation that never received capital gains taxation.) Trust related things.

There's the idea that 501(c)(4)s allow wealth to be transferred untaxed while retaining control over the assets (particularly because those organizations can engage in political activity, but I'd guess generally some of the organizations exert lots of influence/prestige.)

So perhaps OP is suggesting that maybe there's some fungibility in income tax % and wealth tax %, but when you look at the tax code the equivalency looks pretty weak currently.