Well Elon did say it wasn't "safety optimized"...The cold gas tanks (COPVs) of the Roadster are 600L holding 250kgs of gas, stored at roughly 350 bar of pressure. A 100% lethal amount of damage to the human body is around 3-4 bar. If you get into an accident that damages the COPVs, they will explode turning your body into mist like an above ground reenactment of the Titan sub.