To say that AI will start doing what it wants for its own purposes is like saying a calculator will start making its own calculations. A calculator is a tool for humans to do math more quickly and accurately than they could ever do by hand; similarly AI computers are tools for us to perform tasks too difficult or expensive for us to do on our own, such as analyzing large data sets, or keeping up to date on medical research. Like calculators, AI tools require human input and human directions.