Australia spends $33bn per year on defense. An F-35 fighter jet costs $88mm dollars. An M1 Abrams tank is between $9mm and $24mm. A Gerald Ford class air carrier is $13bn. Elon Musk has enough money to buy an army the equivalent of any nation in the world other than the US, Russia, China, and India and operate it for years, even if he never makes another dollar in his life. Nobody should have enough money to do that. What would taxing billionaires do? Limit their power.