This approach has proved effective, in its own terms. The rhetoric
of open source has convinced many businesses and individuals to use,
and even develop, free software, which has extended our
community—but only at the superficial, practical level. The
philosophy of open source, with its purely practical values, impedes
understanding of the deeper ideas of free software; it brings many
people into our community, but does not teach them to defend it. That
is good, as far as it goes, but it is not enough to make freedom
secure. Attracting users to free software takes them just part of the
way to becoming defenders of their own freedom.