The more I work with computers, the more I realize that you can't trust them. They don't know beans and they lie about it. In fact if you ask them nicely to do something for you, right away they zip off and do it or so they say. Unless you have Nazi type systems or extra enhanced bugging/error checkers sitting there to make sure what they did was correct, they won't care if it is correct or not. And they are very good at decieving all those other devices that say the computer is working correctly (after all they are part of the computer as well).
In a lot of ways it is like a 5-year old boy. You ask him to go wash his hands; off he heads to the bathroom to return immediately. You say, "I didn't hear any water running." With a surprised look he runs back. As he steps out of the bathroom, you asked if he used soap and back he goes. Finally, he comes out and you are stuck with two options. One go back and watch him wash his hands or two believe that he did it and let him die of e. coli because he really didn't wash his hands. So your only option is clear...or is it?