Your laptop computer does do what it was programmed to do, to the point of absurdity. It will keep executing a computer bug over and ever. Despite the fact that

Your laptop computer does do what it was programmed to do, to the point of absurdity. It will keep executing a computer bug over and ever. Despite the fact that isn't what you intended, it still executes the code anyway. An AI will continue to execute, even when it stops doing what we intended it to do. Computers don't care about our original intentions, they just execute code. A program "complex enough to simulate the human mind" would probably have even more bugs that result in unintentional behavior. Not fewer.