Who makes that decision? In a democracy, the people do, via the government they elect.
> The idea of wealth is just very different in the modern world. If wealthy people were hoarding (keeping a bunch of stuff without using it), then taxing would put that stuff back to use. But wealthy people hold onto money-producing assets, which means someone is still using the stuff....
> I'd much prefer that we tax consumption. It could be a 1000% tax for a Ferrari. Encourages better use of stuff and can be very progressive without triggering as much anger.
One important thing that's missing from your analysis is power. One important function of inheritance taxes is make wealth-power less hereditary.
Also, wealthy people consume less, proportional to their wealth, than poorer people do. It's pretty much impossible for a billionaire to "consume" their fortune, unless they decide to do something useless and absurdly grand, like building a thousand ziggurats or something. Consumption taxes only work to concentrate the tax burden on non-wealthy people.