It is rooted within a minority who tbh, see nothing wrong with it.
Within people we know I can list the following...
A neighbour who we know buys stuff from a local prolific shoplifter.
That prolific shoplifter used to live 2 doors up, he's been like it for 20 years.
We have friends of 30 years who come from a rough background. The grandmother (in her 80s)sees nothing wrong with her daughter (in her 60s) shoplifting and buys from her. The daughters grandson has been done for supplying cannabis. The whole family used to be quite nice, albeit rough around the edges 30 years ago but seem to have degenerated into a seeting mass of law breaking...and shrug their shoulders at the fact its illegal.
I was in Asda 2 weeks ago, I witnessed what I thought were two instances of people putting items in their personal shopping bag. Now they might have been taking it out at the tills....I don't know but it looked suspicious. I also note there were 3 security guards on the doors there last week.
It's difficult to nail it down, society cohesion has gone down the pan in the last 30 years, we are nothing (for the most part) more than isolated families living in estates with such a turnover of people that no one knows each other, there is no fear of being called out within the 'community
Add to that, the pressures on families with Inflation, energy costs, rent at ridiculous levels etc etc etc while companies make mountainous profits. You wonder why people do it ?