My favorite response along these lines came from Cynthia Rigby, professor of theology at Austin Presbyterian Seminary. She wrote:
Until every stomach is full, until every family is housed, until every child can go to school healthy, clothed, and with a pencil and notebook in hand, the world has not improved enough to throw around such generalities.
It is part of the Gruntled creed to believe that better is better. Making things better is worth doing, even if we don't - or can't - make things perfect.