These workers didn't sell products, but did very low level tech work, but the entire operation was mired in drama. For example, we had a strict no drugs policy, and no weapons policy on campus, zero tolerance. So, say that one of your employees comes up crying that she is getting fired because she did heroin during work hours, and she needs to money for her unborn child (this happened!), or a guy gets angry at being fired because he was pulling out his new .45 from his waistband to show his cubicle neighbors. We had a LOT of this stuff, and as a result, many zero tolerance policies.
It's difficult to understand how many hard living, disadvantaged people there are in this country, even in wealthy areas like the Bay Area of CA, who bring their rough living to work with them. What do you do as an employer? Do you tolerate this to be friendlier to the employees, and someone gets killed, making you liable? Do you come down like a hardass and dehumanize them even more, but cover your butt? Neither choice is good, but it's the latter that usually happens.