The people at the checkouts are typically not the ones stealing things.

There is a bit of a spate here in the UK where just walk in, literally empty shelves into bags and walk out. Some security guards or assistants try to intervene, but apparently some security guards (e.g. ones at apple stores) are told not to try and intervene so really what's the point?

The plot twist for this though is that the police are increasingly using "facial recognition vans" to spot people walking around in town centers and apprehending them for thefts from stores, sometimes months previously since they have CCTV footage of them doing it. One hopes there is more evidence than just a hit on the facial ID database as we all know how inaccurate and biased they can be.