If the aircraft spills fuel and burns as a result of an impact, is that fire not part of the impact? Therefore does the propensity of the aircraft to burn, directly impact on the certification requirements as to survivability of the occupants in the event of an accident?
Accidents happen, that's why we train. Accidents happen at sea, that's why we have HUET courses. They shouldn't, nobody plans to have an accident, but they do occur. The skids are designed to spread to take an impact, It improves survivability. Seat belts are mandatory.
Bladders are designed to reduce fuel spill, since it is a known issue, is enough being done to protect life?