This intervening guy in the linked video had better be a regular customer or an Asset Protection dude, or he is most certainly fired. The store can’t let a regular employee do this.
Companies fear lawsuits. We can change the law to protect them from such suits. But then employees might overreach, causing public outrage in the law to be changed back… Etc. etc.
No system works. If a store can do enough to stop this sort of thing, they can infringe on people’s rights. If the store is restrained enough to not so infringe, they are open to such a criminal action attempt being successful.
We could try a straight-up, “It all depends on if the guy actually was a thief,” and put liability on the individual. Then there would be all sorts of PC problems. Statistics would eventually show a disproportionate amount of criminal action by certaiN demographics. Plus, there would be questions of “profiling” and “disparate treatment/impact.”
So, between personal rights and “civil rights,” we are forced to allow flagrant thievery. Don’t you just love our “freedom”?