I think you misread my last sentence. Stolen goods are internalized costs since they register directly as a write down of value. An employee getting murdered in the store does not seem to be appropriately internalized as a cost though, since they aren’t appropriately funding store safety and security. Instead, the communities are bearing those costs by losing their people and living among higher violence. There is an assumption baked into this (noted in the article) that robbery isn’t fungible. Instead, the suggestion is that stores heavy in cash and low in security foster robbery, which sounds logical to me.