My point is that people in unfamiliar situations, particularly stressful and panicked ones, tend to stop thinking and revert to familiar behaviors. For most people, that's gathering their stuff before leaving. Their behavior will never change based on legal penalties applied months later. To get them to behave differently, they have to practice the different behavior beforehand.

Parking is a normal, common activity with no reasonable expectation of panic or stress. People have plenty of time to think about what they're doing. That's why legal penalties are an effective deterrent. I have no idea what would lead you to believe that the situations are comparable.