The sign of a good villain, Darky makes me angry enough to want to speak to him personally. Here's what I would say:
What you're espousing is the ideal of weakness, the philosophy of giving up. Light isn't self-sustaining, good doesn't last forever, and hope can be broken, you say. That's true. But you're saying that makes it a crime to try to make the world better, because whatever you build will be torn down some time in the future. Then you fail to consider the present. If the sun will only shine one more day, that makes it all the more important to enjoy it while it lasts. Joy is fleeting, all things fall apart, and nothing that's worth doing is ever easy. That doesn't mean nothing is worth doing, it means you have to try harder. You make the world better with hard fucking work, not by wallowing in misery and lashing out at someone who tries to do what you don't have the courage to.
And, the main reason anyone ever loses hope is because of people like you.
"I’m not asking you to accept everyone and everything the same, I’m not defending the rights of KKK or anything. I’m asking if you can accept the possibility, the idea, of any one ideology or belief system or faith or doctrine or lifestyle that may be just as good as yours. I want you to look at the world in all its splendor and glory, absorb its millions of cultures, imagine that you know and love every single living person, and ask yourself, really ask yourself - don’t cheat and look to anyone or anything for answers, but figure this one thing out all by yourself:
"Do you really think you’re better than everyone else?"