There's some things in this article that I agree with, and some that I don't. First off, I disagree with the author basically saying that Wal Mart should not be trying to catch shoplifters. Shoplifters are still criminals, and some of them turn out to be even bigger criminals, with warrants or priors, so catching them is a good thing. Further, the police do not have to arrest every shoplifter that Wal-Mart catches, even if WM wants to prosecute. The shoplifters can still be trespassed, escorted out, and then released with a notice to appear, meaning that they are charged and have to appear in court, but will not take the ride to jail that day. It's basically like be arrested, charged, and released all at once. That is up to the discretion of the individual officer. Further, the author states that the comment that one officer makes about it being "a revolving door" is a complaint about Wal Mart. Clearly, it is not. It is a complaint about the fact that some people are just scumbags, and they get arrested one week and then are back stealing the next week. The cop is complaining about the people he has to arrest, not Wal-Mart.
Now for the part I do agree with. Although I generally dislike the way Target has been treating the TPS position lately, I think it is good to have uniformed security in a store. The cops don't need to be called because someone is loitering in the parking lot or being loud in the store, or skateboarding, or whatever. A uniformed security guard can go over and tell these people to beat it and 99% of the time, they'll leave right away and not come back. The cops can be called for the remaining 1%. Even if a store doesn't want to invest in uniformed security, a manager should be able to fairly effectively deal with this stuff without calling the cops. There was only one person I ever had to call the cops on because they refused to leave. Everyone else just gave up and took off when someone if a uniform told them to hit the bricks.
I did note that the Wal Mart near me has uniformed contract security guards, one patrolling the parking lot in a vehicle and one at each exit door, but I assume that is because they are a supercenter with very high volume in a very sketchy area. Also, Wal Mart has announced that they are rolling out a new "customer host" position that sounds a bit like a TPS in the job description, so we'll see if that makes any difference as to the PD call volume.