By what mechanism would increasing the tax rate result in getting less money from rich people? I can only imagine the answer is because they reduce their income, though I don't know what your explanation is for rich people reducing their income when the tax rate hits 70% ± 10%. What's more, if rich people are reducing their income, it seems to me that this means they're not taking advantage of as many opportunities to earn money as otherwise, which hopefully means not-so-rich people are now taking advantage of those opportunities (or, more cynically, are not being taken advantage of as much by rich people).

So yes, if taxing rich people more means getting less money from them, and if the reasoning for this leads to not-so-rich people earning more money, then that seems like a win.