Where are our claws? Fangs?
Clearly, you have not looked a primate in the mouth, ever. http://www.google.com/images?q=primate+fangs
1) brakes are always stronger than the engine. There is no car in the world that will not stop when braked, even if the accelerator is held full down. It's a basic safety requirement. The Prius has an _additional_ system that cuts power when the brakes are held down.
2) the emergency brake operates through a limited strength wire that pulls only the rear brakes (typically) and has far less braking power than the brake peddle.
3) every car on the planet will mechanically cut all power to the drive wheels by shifting into neutral.
1) Not if the brakes are bad, installed improperly, or computer controlled. All ABS brakes have some sort of computer control system. If it's the same system that controls the throttle... well, there you have it.
2) Agreed, but in a front wheel drive car, unless the wire is stretched from overuse or designed to do otherwise, the rear wheels should at least lock (or near lock) to some extent.
3) SHOULD, yes. DOES, not necessarily. Transmission inputs can be computer controlled as well, especially in automatic transmission vehicles.