It’s hard not to be affected by this—the whole reason she even exists is an unfortunate chain of events stemming directly from Zero Dawn. She knows more about that, now, but there would be no escaping it even if she wanted to. Aloy holds the key to the terraforming system, and it's her responsibility to safeguard Elizabet's dream, and make sure that life on Earth continues. Still, she tilts her head to the side a bit at Shepard's reaction--it's a sympathetic kind of thing that indicates she's seen destruction, but perhaps hasn't conceived of it on this scale.

"Humans got used to fighting wars with machines instead of soldiers. Self-sustaining armies that could turn biomass into fuel in emergency situations. I guess that worked well for a while, but then there was a glitch, in one of the units. Made the whole swarm go out of control. They spread it to others."

She figures Shepard can probably fill in the blanks from there.

"No backdoor." That's the part that gets her, every time. The hubris of it. Faro, thinking he could control that kind of monster, that he'd never need an emergency shutdown. "So, they reproduced. Corrupted other machines. By the time someone found the glitch, it was already too late."