I appreciate your response and it is too bad that you were downvoted for trying to help. Whoever downvoted you should have provided their explanation if it was so obvious to them that you were wrong. I think the problem is that we are dealing with bad writing. My problem with your explanation is that it means everybody except the homeless population of the city is "insulated from the city." As far as insightful openings go, this is not my choice for the introduction. This is especially silly if you try and imagine any "booming industry" that would not be "insulated from the city." Once again thanks for your effort and I apologize that someone downvoted you for trying to be a helpful member of the community.