[That strikes her as an incredibly, impossibly selfless reason, and she's speechless for a moment.]

There are these... aliens. They're from a parallel dimension that's nothing like ours. They're parasites, and when they come here, they take human hosts.

They consume souls - human souls. And Earth is theirs. Everything here, everything in everybody's lives, only exists to keep humans occupied until mealtime.

Do you get what I'm saying? This is why humans exist. They're like cows.