So, here's the link to that particular reddit gem, in case you want to read it in all its glory:
https://www.reddit.com/r/Shoplifting/comments/56saoh/selfche...
I'm... almost sympathetic to an argument that amounts to the frustrating/dark side of automated assistance, which is probably something the audience here would do well to consider. I get frustrated with tech too and sometimes want a way around it.
But I wish that discussion was still active so I could reply... WTF, man. They're offering an automated way to complete a purchase, and it's not like you got paid to interact with the checkout cashier before. But let's say you see it that way. Let's assume that cashier was costing the store $25/hr (maybe), so the 6 minutes (maybe) they worked on your purchase might be worth up to $2.50. Are you scrupulously making sure you only evened the score/took the store to the tune of ten quarters?
Unless you can't for some reason, pay for your groceries, don't inflate the prices everyone else has to pay to offset the cost of "external shrinkage," and keep society in the crucial resource of trust.