I suppose when you're an unskilled worker on minimum wage packing 2,000 parcels a week for people who are customers of the company that exploit you, customers you'll never have to face or deal with, mis-packing something every once in a while hardly bothers you, and why would it?
Just like the highly pressurised, demotivated minimum wage couriers who work under immense pressure from Amazon ON A SUNDAY to deliver arbitrary, throw-away impulse purchases to people who "simply MUST have it TOMORROW!" - people complain when the couriers take short cuts - no, they shouldn't take short cuts or card people when they're clearly IN, but then I can imagine the average courier saying "Give me some incentive to do my job properly - apart from my wages - because I don't feel any."
Monotonous jobs done for companies who reward you little, if AT ALL, are done "good enough", not "par excellence".