Nina

“There was this other apocalypse this one time. And, well, I took off. But this time, I don't... I don't know."

"Well, what's different?"

"Well, I guess I was kinda new to being around humans before. And now I've seen a lot more, gotten to know people, seen what they're capable of and I guess I just realize how amazingly... screwed up they all are. I mean, really, really screwed up in a monumental fashion."

"Oh."

"And they have no purpose that unites them, so they just drift around, blundering through life until they die. Which they-they know is coming, yet every single one of them is surprised when it happens to them. They're incapable of thinking about what they want beyond the moment. They kill each other, which is clearly insane, and yet, here's the thing. When it's something that really matters, they fight. I mean, they're lame morons for fighting. But they do. They never... They never quit. And so I guess I will keep fighting, too.”
― Joss Whedon