An actuator getting stuck on heavy acceleration? I'm also a skeptic, but you should be more clear about what your concern is, since the proponents will say some kind of automatic radar braking system could have prevented this.
On many cars, even if a deliberately hostile entity takes control of your gas pedal, hitting the brakes cuts power to the engine. And even if it doesn't, brakes can usually (not always, but usually) win a fight with the accelerator.
I'm afraid of the interaction between laypeople, a retrofitted cruise control that was designed on a kickstarter budget and several tonnes of hurtling steel.
