I'm not sure that I would agree with the claim that the state is unable to stop shoplifters. The case here was Australia, but speaking to the United States:

You can't really do anything about shoplifting until after it happens. It's not a crime until it's been committed, then you can prosecute. The issue is there is a base level cost to do so, and it's going to take a very large amount of shoplifting to balance that. We as a society have basically accepted that certain crimes don't go punished, and it seems like low value shoplifting largely fits that category.

In turn, large companies have decided that they will instead collect data on their own until they have enough to make it a high value issue, with proof. Then the state will prosecute. The issue here is that companies do not get to illegally collect data, they still would have to do so within the bounds of the law. So what are those bounds? We say the Government can surveil us with impunity, but only for terrorism or whatever else gets brought under that umbrella. For "petty" crimes the government would need permission to collect the amount of data that these companies are and then build their case with that.

This isn't to say that shoplifting is okay, just that society doesn't seem to care all that much. Our reaction to companies taking actions like these will also show how much we seem to care about them as well. Spoiler on that last one: we don't seem to care (in the US).

It definitely depends on the state and store policy.

A Walmart in AZ has sent gigantic bouncers after me to detain me on suspicion of shoplifting a $5 bag of cat litter. In my state they are allowed to kidnap/imprison you until police arrive if they have 'reasonable suspicion' you're in the act of shoplifting, so yeah have fun guessing whether the guy with the walmart badge is actually security or just a rapist.

We could pass laws that allow and encourage security officers at grocery stores to get physical to stop shoplifting. Arm them too.

That's what Trump/MAGA america wants. They want to see some dude who steal stuff get shot for their crime. They will gleeful cheer it on.

This entire well is completely poisoned by the bad-faith whingeing of retailers end to end.

First of all; in times long past, retailers had zero shoplifting incidents, because every order was fulfilled by their employees, who would pick from the stock room and present the customer with a ready-to-take bag of their goods, and a purchase receipt. Shoplifting in this context was basically impossible.

The advent of customers picking out their own goods let to the introduction of customers attempting to leave the store without paying, but it also saved retailers incredible amounts of money, not having to pay to have employees both stock and pull orders.

However, because nothing is ever profitable enough, much further down the line (and, worth noting, when crimes are at historic lows) we get self checkouts, which are basically honor boxes with speakers. And that's fine, I love self checkout and my only complaint with it is now retailers are over-reliant on it, and, again in the name of cost-cutting, have 6 to 10 registers overseen by one worker, who has to sprint between them to sort out when the stupid things can't detect a light item, or have a conniption fit when you don't place a 75" television on them, and of course they have to also make sure all of those registers are ringing up the correct items, which has itself then given rise to bag checkers at the door.

And to be clear, I'm not like, endorsing any particular system here. I don't care how stores want to convey products to me terribly, just make it clear what the fuck I'm supposed to do, and I'll do it. What I am saying is retail theft is largely enabled by retailers who do nothing but chase the bottom line and constantly try and make their stores work with fewer and fewer people who are less and less skilled over time and are then SHOCKED when someone just takes something, because their ludicrously under-staffed stores are incredibly easy to steal from, if you want to.

And I would ALSO point out that throughout this long history, the cost of slippage has been built into the business, because theft is far, far from the only reason a product that is purchased wholesale may not make it all the way to a paying customer. Retail supply chains and especially grocery ones are simply AWASH in waste, and somehow, all the time, these stores make money.

So no, as a customer and taxpayer, I don't particularly give much of a shit about shoplifting.