> Taxes don't usually work as efficiently because the state is usually a much more sloppy investor. But it's far from hopeless, see DARPA.

Be careful. The data does not confirm that narrative. You mentioned the 1950s, which is a poignant example of reality conflicting with sponsored narrative. Pre WOII, the wealthy class orbiting the monopolists, and by extension their installed politicians, had no other ideas than to keep lowering taxes for the rich on and on, even if it only deepened the endless economic crisis. Many of them had fallen in the trap of believing their own narratives, something we know as the Cult of Wealth.

Meanwhile, average Americans lived on food stamps. Politically deadlocked in quasi-religious ideas of "bad governments versus wise business men", America kept falling deeper. Meanwhile, with just 175,000 serving on active duty, the U.S. Army was the 18th biggest in the world[1], poorly equipped, poorly trained. Right wing isolationism had brought the country in a precarious position. Then two things happened. Roosevelt and WOII.

In a unique moment, the state took matters in their own hands. The sheer excellence in planning, efficiency, speed and execution of the state baffled the republicans, putting the oligarchic model of the economy to shame. The economy grew tremendously as well, something the oligarchy could not pull of. It is not well-known that WOII depended largely on state-operated industries, because the former class quickly understood how much the state's performance threatened their narratives. So they invested in disinformation campaigns, claiming the efforts and achievements of the government as their own.

1. https://www.politico.com/magazine/story/2019/06/06/how-world...