Funny, that's the same thing they keep saying about "socialism." It's not that it doesn't work, it just hasn't been implemented by the right people yet.
Interesting, however, that our democratic republic has stood the test of time and proven to be the most powerful and free nation history has ever seen, despite the fact that the wrong people have controlled it at times. Give me freedom over socialism anyday.
No no that's not it at all. Socialism hasn't worked because it is entertaining enough! Well except to those who aren't part of it and are watching from the outside.