People will say stupid stuff like "oh it’s because we pay for their defense", or "oh it’s because we have freedom", or "but but this would never work here, because we’re really different than anyone else".
But actually? It’s because we’re used to this shit and change makes us uncomfortable. We also really only care about ourselves, not our broader community.
Have you ever wondered why we have vertical gaps in public bathroom stalls? Inertia. There’s no reason to have them, but nobody cares enough to improve it. A better design isn’t more expensive or more difficult, we just don’t want it enough to make it happen.
We’re stuck in a local maximum.