Is this really that a factor with 24/7 surveillance and legal repercussions for theft? I mean...you're making it sound like it is, and I believe you but it's just so hard to people employees are that stupid.
Not much has actually changed regarding this structurally, the surveillance has been there for 30 years and the legal aspect forever. Desperate and or stupid people, do desperate and stupid things. What has changed, is Walmart now has dramatically less cash flowing through it at the point of sales (due to cards or Walmart Pay et al). Merchandise theft is by far the bigger problem these days for Walmart. The same goes for places like liquor stores (which used to be an extremely cash heavy business, but now are mostly cards).