To a point what is ethical can depend on the circumstances. In a tribal society with limited scientific or social structures to support investigations, and appropriate legal and justice system might look appalling from our point of view but be the best they can support. However if you do have the technical and cultural resources to support a professional police force, crime labs, judicial process etc, saying that keeping the tribal justice system is ok because culture is relative becomes unsupportable IMHO.

In modern developed society it should never be the case that a person's best economic choice is to sell their health and life for money. It's just not necessary for people to be in that position unless someone wants them to be in that position. Why would anyone want that?

What's the motivation for crating those conditions, and if people do want to put people in that position, how can the rest of us trust that the safeguards someone who would want that would put in place are sufficient and robust?