A low-trust society.
Big-Box stores are monuments to a Hight-Trust Society. They didn't come to be in Moslem or even Soviet societies, where the emphasis was on, variously, public piety or subjugation to political ideology and political masters. In both worlds, petty theft, or even high-value theft, when done against someone not politically-connected...such was the order of the day.
Now, we've imported 100 million Turd World potentates of Diversity, and - Surprise! - we're turning into the Turd World. Malls are closing and stores have to put locks on everything. Even security patrols at the exits don't work, when the government refuses to punish crime with a value under a certain not-petty limit. And when corrupt judges refuse to incarcerate thieves because of the color of their SKIN.
This is - obviously - why shopping malls are dying. I'm in an area that's about a decade behind the general societal decay, and our local mall is thriving. Because we don't have dindus staging shooting wars, and we don't have Pak!s walking out of department stores laden with boxes they haven't paid for, cannot pay for, will not pay for.
But Elites in government refuse to address it, so, for law-abiding citizens-now-subjects, we're faced with everything in a store, under lock and key.