It is a not about being open-minded. It is about defining to the word
"freedom". According to http://www.dictionary.com/browse/freedom (but pick
any dictionary you want), "freedom" is "exemption from external control,
interference, regulation, etc.". A program does not control you because it
has no CLI. If its license is proprietary though, then it prevents you from
adding/improving its CLI: that is external control.
