To teach use of a non-free program is to implant dependence on its owner, which contradicts the social mission of the school.
Bertrand Russell's The Impact of Science on Society (1952) should probably be given another read:
Fichte laid it down that, education should aim at destroying free will, so that, after pupils have left school, they shall be incapable, throughout the rest of their lives, of thinking or acting otherwise than as their schoolmasters would have wished [...] to produce the sort of character and the sort of beliefs that the authorities consider desirable, and any serious criticism of the powers that be will become psychologically impossible. Even if all are miserable, all will believe themselves happy, because the government will tell them that they are so.
Now consider when the http://en.wikipedia.org/wiki/Bilderberg_Group met for the first time (1954) and who gets to attend...
My manager has my personal email address (I have hers). She has used it once: on the final day of a holiday last year she emailed to tell me that the office was shut to non-essential staff due to a problem with the water supply. That's the way it should be! She also has my mobile phone number, but she's never called it.
When and where are you hiring?
Machines have less problems. I'd like to be a machine. -- Andy Warhol