Is that surprising? What happens if the person eating the expired food gets sick and sues the store?
Your local deli in the grocery store takes chickens closest to Sell By dates and rotisserie cooks them or fries them for sale. Then they sit for a few days again, and left unsold get deboned and shredded up into chicken salad, where they sit for another week.
Everyone should be required to work in the food service industry for at least one full year.