A second source of concern is that controlling a superintelligent machine (or even instilling it with human-compatible values) may be an even harder problem than naïvely supposed. Some AI researchers believe that a superintelligence would naturally resist attempts to shut it off, and that preprogramming a superintelligence with complicated human values may be an extremely difficult technical task.[1][7] In contrast, skeptics such as Facebook's Yann LeCun argue that superintelligent machines will have no desire for self-preservation.[9]