The camera and screen seem to be there as a deterrent. I hate them too but they're easy to avoid by not shopping at locations with them. My guess is their exist

The camera and screen seem to be there as a deterrent. I hate them too but they're easy to avoid by not shopping at locations with them. My guess is their existence is based on the "shrinkage" rate at each store. Of course, this choice becomes more difficult if you don't have the means to travel further, something much more likely for those who live in an area with high shrinkage rates.