Earlier quoted context omitted.
> empirically, removing the exemption discourages R&D. Not clearing a road means fewer people use it, but you not going out with a shovel to clear a public roads isn’t you discouraging their use nor is you canceling your plans to clear said roads. Having zero subsidies is the default situation.
The default situation is whatever was yesterday. I’d be astonished to learn that even a single significant civilization functioned without subsidies or patronage of priorities held by a society’s leaders.
If Amazon delivered you a TV yesterday that doesn’t suddenly become the default where you can expect another one today and every day after that.
The US government does a new budget every year, making every year a new ballgame.