I worked in a DIY store in the early 90s and we had shoplifting gangs regularly take trolley loads of high value stuff away. We got to know them by sight and got a fiver (!) if we spotted them in store and reported it to management.
Local police advice then was not to challenge them when leaving the store with goods (they were known to be violent) and instead get a description and try and note down what they'd taken and let them know.
(Pre- phone, that meant someone from the checkouts running down the road at a safe distance writing notes on a bit of paper rather than a taking a photo or video!)
The police would wait for a few reports to come in and, based on descriptions, raid a few known properties and make arrests then. None of this type of shoplifting is new.
However, shops only have themselves to blame for a lot of the levels of current casual shoplifting.
If you try and run a store with a skeleton staff because you're making everyone ring up their own shopping to maximise your profits , I would say it's quite clear what will happen.
If you demonstrate you don't value your stock by not investing in staff to safeguard it, don't be surprised when the general public don't either.