Mild steel is used in crumple zones. Stainless steel (like the Cybertruck) is not. Mild steel is much more malleable and provides a much better crumpling. As we

Mild steel is used in crumple zones. Stainless steel (like the Cybertruck) is not. Mild steel is much more malleable and provides a much better crumpling. As well as a whole lotta engineering behind the scenes to optimize the type of crumpling. Since stainless steel has chromium in it, it's much tougher when impacted. Which is great for being bulletproof, but is absolutely not the best choice when it comes to prioritizing passenger safety. EDIT: this isn't me being some contrarian cuz I don't like Elon. This is thousands of scientists' discoveries, research, and data over the course of almost 100 years at the tops of their fields in material sciences. If stainless steel could make a good metal to ensure passenger safety, we'd be using it by now.