The point is not that this world is too sad to love or too glad not to love; the point is that when you do love a thing, its gladness is a reason for loving it, and its sadness a reason for loving it more.
The moral earth, too, is round! The moral earth, too, has its antipodes! The antipodes, too, have their right to exist! There is still another world to be discovered--and more than one! Set sail, you philosophers!
Imagine a world in which you had Saddam Hussein, who had the capacity to make a weapon of mass destruction, who was paying suiciders to kill innocent life. Imagine what the world would be like with him in power. The idea is to try to help change the Middle East. Part of the reason we went into Iraq was we thought he had weapons of mass destruction. It turns out he didn't, but he had the capacity to make weapons of mass destruction.
It's always easy to blame others. You can spend your entire life blaming the world, but your successes or failures are entirely your own responsibility.