Those gizmos trade having the car slide instead of spin or flip, they don't break the laws of physics, so be safe out there you don't want to under steer into the oncoming lane someday. Regarding this accident, it's happened that people black-out/pass-out/fall-asleep/have-a-heart-attack/and-so-forth and the weight of their foot on the accelerator - well guess what - accelerates the car.