Imagine for a moment, you run a shop.
Lets call it... TesWilkBury's... anyway, you lose around 2K a week through shoplifters when you don't have security guards on.
You've done all the courses, you've been running a shop 20 years and you know the usual things to look out for - lots of bags, baggy clothing, furtive behaviour, a certain look, age group etc etc.
You also know that accosting people after they have stolen something and left the store results in lots of drama and the person usually getting away, or if you do grab them, then lots of paperwork, waiting around for the police, they get taken away get a smacked wrist and they're back in a week or a month, at it again.
Do you.. carry on letting this happen .. or..
Do you employ security guards who will occasionally follow someone around who fits into one or more of the criteria that from your experience, means probably going to nick something.
You know from other branches of TesWilkBury's that doing so cuts shoplifting losses down to just £500 a week.
You also know that a small handful of shoppers will probably be intimidated and pissed off at being followed when they've done nothing wrong, however between them, they do not spend £1500 a week in your store.
What a conundrum!
I've been followed, it feels rude, it is annoying because I know I am not a shoplifter - but I also know that they do not know that.
I also prefer not to have the price of the food and goods I buy, bumped up by the cost that shoplifters inevitably pass on to other shoppers.