There are plenty of times in which what the computer is told to do (and consequently does, as is their wont) is not the same as what the user might WANT it to d

There are plenty of times in which what the computer is told to do (and consequently does, as is their wont) is not the same as what the user might WANT it to do. Compare the computer: "The user runs this program, the program tells me to wipe the hard drive, I wipe the hard drive", and the user: "I just downloaded Medal of Honor and I want to play it". Another example: the computer: "The user entered 'rm -rf doc', I delete ./doc/", and the user: "I want to get rid of 'Documents/' for the 23rd time today and execute 'rm -rf doc<tab>'". The discrepancy between "do what I say" and "do what I mean" is part of where security lives. In the above cases, that would be a virus scanner and your favourite *nix command line trash utility, respectively. Other examples can easily be imagined. Just because a user tells you to do something doesn't mean they want you to do it.