We consider a mainstream grocery store a place where you can support a healthy diet on a regular basis. A fringe food location is the opposite; it is not inherently bad, but when it's the primary food source, local diets and public health suffer.
Can the market do well by doing some good? Why not? In Chicago alone we have identified a half-million-plus people who live in a Food Desert with no or distant grocery stores but nearby access to fast food.