I don't think those are random density factors. I don't believe that darts were thrown at a wall with words written on them and they landed on "Coffee Shops" a

I don't think those are random density factors. I don't believe that darts were thrown at a wall with words written on them and they landed on "Coffee Shops" and "Fried Chicken". I think the analysis started with the assumption that Coffee shops would be found in nicer areas and Fried Chicken would be found in rougher areas. Then the analysis was started to evaluate that hypothesis. It's OK that areas of with different economic conditions may have different types of businesses. Buying a house next to a check cashing shop or a pay day lender will nearly 100% guarantee you aren't living in the best neighborhood.