Vonnegut may have wanted to appeal to readers' interests in prophecies about the future. ... Vonnegut almost certainly wanted to mock the growing emphasis in his day not simply on equality of opportunities (which most people endorse) but equality of outcomes (which many people think is impossible to dictate).
Answer: I think that the moral of the story is that we can find happiness <u>even</u> in the darkest of times. This is because there was still hope even in all of that Hate, Envy, Suffering, Sickness etc.