This particular restriction we're talking about was completely unjustifiable. But the regs exist, and they aren't just made up nonsense. They're the result of systems engineering and a real risk management process.
What universe are you in?
The FAA can’t even find and identify most of the dickheads flying drones around restricted airspace. You think they give a shit about drones in rural areas around smaller airports? Drones are cheap and easily accessible, orders of magnitude easier to get than an airplane in terms of actual acquisition and the license (spoiler: most drone users aren’t licensed). Compare both of those things with the cost of getting a PPL, to say nothing of how expensive even a small plane is. It isn’t just the US, either - I’ve flown small planes in both America and Australia, and drones are something that both the FAA and CASA clearly aren’t equipped to deal with. Regulations and laws don’t matter if you can’t enforce them because you can’t identify the perpetrator.