I think Sagan made a brilliant job of showing the folly of mankind, hell bent on conquering his neighbour instead of learning from him. He highlights the futility of war, of the rivers of blood, the mass slaughter of millions of people for what? For a little more land, a little more oil, or simply because they worship different Gods. What can be more pointless, more a waste of human lives, than killing in the name of your chosen God? If there really is a God then surely He would be utterly dismayed at the barbaric acts of cruelty visited on the inhabitants of one part of our pale blue dot by the inhabitants of another. This planet is all we have, we need to care for it, treasure it, appreciate it and learn to share it it peace and understanding with all the other people that share our amazing home.