SD, I can't speak for others but my goal is to keep proven, effective, and efficient programs for the poor and working poor.  And just because we have a program doesn't mean it meets that criteria.  Additionally an in place program doesn't rule out a better way to accomplish the same thing.  If we are not even willing to explore better ideas then we have reached stagnation and one can argue so called liberals are actually conservatives and have become reactionary to any questioning or change.