F’rinstance: South Korean prison guard.
And this is necessary because … CCTV is too efficient and cost effective and doesn’t involve cool proto-Daleks? Now, if Robo-Guard wandered up and down gen-pop shouting “EX-TER-MI-NATE!” randomly, then I might be able to get behind this.
This article at Phys.org appears to have an accurate read on this. It’s not that South Korea thinks robo-screws are really all that necessary, but that prisons have a compliant population upon which to test new technology.