I honestly don't understand why some people seem to be interpreting "shop" to mean "machine shop". It could also mean retail, so the category is much broader than you imply, and the risks and costs of failure in this broader category are much lower than software that typically affects hundreds to thousands of people, even for lowly software jobs.

Ever deal with drunk people while coding? Shoplifters? Code Adam? Homeless? Been robbed? Screw up those interactions and it's pretty serious. If you can mess up a software delivery in a similar amount of time then your organization isn't doing any type of serious engineering.

I worked in a Kmart one summer and some dummy sprayed oven cleaner in my face. I would have been less upset if he'd shut off access to Twitter for me a day or two.