Rogue A.I. Robots

Artificial intelligence is the simulation of intelligence by machines. It is designed to mimic the human brain process of gathering information and making decision on this information. The difference being that the artificial intelligence brain can perform this in an infinitesimally short period of time and the host equipment the brain is in can perform a desired command from the brain in a small fraction of the time it would take a human.
The average person can see the potential problem with this technology. The artificial intelligence brain designed to mimic the human brain in effect will have the same issues a human brain has. The brain will have to be programmed not only to function to maximum efficiency; it will have to abide by human social limitations. The shortest distance, fastest and best way to go beyond a crowd of people with a car is through the people. The brain has to be programmed that it cannot kill people and a multitude of other restrictions. Even the thought of mimicking the human brain is scary. Whose human brain and thought process? The best artificial intelligence brain in the world may be owned and programmed by the most ruthless person in the world.
At what point do artificial intelligence brains get so intelligent and efficient that they determine that they don't even need humans. The following story pertains to these problems.