[The same could be said for you humans, always attacking each other. And not always physically.]
We weren't in possession of their bodies, only their data like we have yours. Mary and I are still making attempts to retrieve your physical bodies, but without the data to return to them - the inmates of Sector 6 can't be restored. At least not without stealing their data back, which...
I don't think we can do. Not yet, not now. All the more reason to preserve yours, you understand? The beach being an unfortunate casualty.