If billionaires didn't exist, then our economy would implode because the billionaires would have the vast majority of their wealth taken from them, they are only left with $1 billion, and then they would have no incentive to produce, leading to the economy failing, tens of millions of people would lose their jobs because no one will manage the businesses anymore since their financial incentive will be gone, and the economy would be destroyed. What's the point of taxing billionaires very highly anyways?