Well, the United States government has it because it ratified an amendment to the Constitution saying it does, via the Constitutionally defined process to do so

Well, the United States government has it because it ratified an amendment to the Constitution saying it does, via the Constitutionally defined process to do so. 1.) Right, I'm going to give up on my dream to get rich because I'm paying a 4% higher marginal tax rate. Nevermind that I can afford an accountant to figure out how to minimize my tax burden and will effectively end up paying a smaller percentage of my wealth. 2.) 'Wealth', as a concept, does not exist except within the structure of the society that recognizes it. Ours happens to be structured so that to some degree you can earn your wealth. It's a Randian fairytale that anyone is wealthy from solely their own effort, though. 3.) That's true. But the U.S. actually has a pretty average tax rate compared to a lot of other places, is more or less stable, and has the largest paying market in the world by far. It's not the only consideration. 4.) That's also true (or at least debatable - a lot of wealthy people invest super conservatively so as to maintain their current wealth, oftentimes right back into the government itself, and are hardly engines of innovation), but you were asking for a basic moral justification, not a full exposition on the effectiveness of the current tax code and budget.