U-Ran gave them juuuust enough sentience to become viciously brutal, enough single-mindedness to throw their own lives away inefficiently, and enough simplicity that you can clearly tell what is happening as it is occurring.
She knows she caused this. That's part of why it scares her.
U-ran is, quite literally, a child. She is competitive and brash but she clearly doesn't have the mental fortitude for this shitshow, and things escalated quickly.