Akashic, you're imposing your values on the people who choose working in a supermarket (hec, someone has to).
Not everyone has the same aspirations as you do. It doesn't mean that they're not intelligent, conscious or otherwise. It just means that's how they want to make a living to pay their bills. Maybe some of them go home and read Dostoyevsky or Aristotle. I suspect many of them are very happy and content. It's all relative.