Sounds like: Never wear seat belts. 1) The seat belt has to successfully detect when it's needed. If that fails, you hit the dashboard at 55mph anyway. 2) The

Sounds like: Never wear seat belts. 1) The seat belt has to successfully detect when it's needed. If that fails, you hit the dashboard at 55mph anyway. 2) The seat belt must ignore false positives. If it cinches up inappropriately, people will struggle to get them working, or release them. 3) If people rely on their seat belts, they will do stupid things like drive off cliffs or into light poles, because people assumed that the seat belt would always work. 4) In the worst case, if the seat belt cinches up inappropriately, people will disable the seat belt, leading people to believe the system might still be somewhat safe... not sure how that follows at all. It's better to not have seat belts (anti-lock braking, impact-safe dashboards, turn signals) at all. That way everyone has to assume that the vehicle is unsafe, and therefore they will need to implement their own safety procedures, like being 100% perfect drivers...