My dad started out at UPS when I was a very little kid. UPS was only in a couple of states and he was in customer service. We moved to Atlanta and then California based upon his job. He got my high school bf, now long time husband, a pt job there when he was 18. He was a pt splitter, then added a pick up driver to splitter for a few years, then was a full time driver for several years, then went into mgt for a few. He left before retiring to help out with the business stuff my dad took care of after my dad unexpectedly died at 57.
We've known a lot of upsers over many years. Your blanket statement is based upon your own experience. I'm not saying you don't believe it. I'm just saying that your own point of view is based upon your own life experience and attitude. Just like mine is.