Walmart put some effort into anti-theft, but mainly they just accepted it as "shrinkage" and relied on the fact that there was still some inherent morality in society that caused most people not to steal. While simultaneously undermining that society. Walmart drove bankrupt businesses that had been part of the framework of small towns; a framework that promoted morality to begin with. Stealing is taboo because the shopkeeper is your neighbor, and you're taking food off his table. The underpinnings that made it a place where you'd want to do business are gone. And then the corp closes up shop, citing "everything stolen."