No doubt that a bigger car has a stronger safety cell. At a given speed you are safer than in a small car. But Bigger cars have stronger engines. They claimed to use the power of the engine only as a safety margin for an escape in an emergency situation. You seem so well protected in a big car.
Accidents seem to happen in newspapers only.
The manufacturer of your car did a remarkably good job selling you an expensive car by causing the illusion of safety. Additionally, big cars have better suspension. So, in a given situation, you will automatically drive faster than with a small car. She was killed by the power of her engine. Because they have this illusion of safety.