Response to last persons reponse
Human beings are perfectly capable of wiping themselves out without the help of mashines. What you should be scared of is climate change, Nuclear war, the over use of anti-biotics, Running out of fossil fuels, over farming and decreasing productivity of land, water shortages as a result of climate change and super viruses.
But there is the possiblity that if mankind were to create Artificial Intellegence that is just like humans then naturally it would try to kill us all, but to write such complex algorithems of the emotions and instinct would be an impossible task from scratch. So we would have to work out a way of digitizing someones mind. This may be possible because a mind is made up of electrical signals and assosiations, just like a computer. This technology may also evolve from virtual reality implants into the brain, and may even bring about this Matrix like world...