There's a few articles floating around that say shoplifting is greater at self checkouts[1], but apparently its not enough to keep these jobs around without regulatory distortion.

One way of thinking about it is that the store shifts responsibility to both the shopper and the police (in the case of shoplifting) but the police might not agree to the additional workload [2]

1 https://www.theatlantic.com/magazine/archive/2018/03/stealin...

2 https://sanfrancisco.cbslocal.com/2016/05/14/shoplifting-cal...