A sports car's acceleration, brakes, and handling describe what it can do under particular conditions. They do not establish how well it will protect occupants in a crash or how much grip is available on today's road. Safety depends on the actual vehicle, its tires and condition, its protective systems, and the driver's decisions.
The useful approach is to separate crash avoidance from crash protection. Suitable tires, visibility, and functioning controls help the driver avoid trouble; seat belts, airbags, and vehicle structure address different parts of occupant protection. Neither group makes excessive speed, poor conditions, or neglected maintenance harmless.