I agree that the ultra-rich living on permanent fake debt backed by their stocks / real estate need to contribute more, but I'm tired of seeing people throw "we can tax the rich" as a panacea.

Productivity is growing much more slowly than the retiree-to-worker ratio. Workers are producing slightly more every year, but there are a lot more retirees to take care of every year. If this does not change, we will eventually see a collapse of social safety nets. Policy can only accelerate or delay that collapse.