I feel bad that my first thought is because it's easier for the cops to fill their ticket quota with stop signs in stupid places people would probably ignore.
People ignore stop signs everywhere, IME. Best case, they slow way down and yield; worst case, they just blow through it entirely. I've even seen cops roll through stop signs. Nobody actually stops unless they would physically hit something if they didn't, and few use turn signals if they're going to turn. It's maddening as a pedestrian.