There is a retard or two working every job at every company on the planet. No company can keep a watchful eye over every single employee and they shouldn't have to. Most of us have done some stupid things on the job, for one reason or another, smart or otherwise. The only difference is these guys got caught.
Personally, I have had nothing but bad experiences with UPS. They, without fail, misdeliver my packages to the same wrong address every time. I prefer purolator, they have done the same thing once or twice but overall I had had much better service with them. The purolator guy even went and picked up a package the UPS misdelivered for me.