[Sheryl is by no means an unintelligent young lady, but she's an artist, not a historian. The look on her face is very much that of a high schooler who's just been asked, on the spot, to explain the root causes of World War I that weren't just "some guy got shot."] Well, you know-- it's really complicated.

They were created as warriors, you know? And one of the battleships that belonged to their enemies crashed on Earth, and humans rebuilt it. So to them, it looked like we were just another enemy.

[Sounds legit.]