Undertown is hardly luxurious, but its unsafe largely because of its inhabitants, not because its collapsing. What transient hazards exist are well understood by the natives. The parts that are unstable, or have some other environmental hazard, dont have people living there. Because they would have died.
A situation where you are doing construction work, otoh, is a whole new scenario. You have rubble, you have rusty metal, you have utility cables. These people have NO experience with it. If you have 9 different people hauling and moving stuff in that environment with no training, they are all a present danger to each other.
Our goal is to keep these people out of our way.
Would be nice if we can get them to do security when Molly isnt around, or to tell us about the layout of the surrounding area.
But we do not benefit from attempting to use them as workers here. Nevermind the ethical issues.