One of the Best Presentations on Poverty and Development (video)
ted.com
ted.com
Even an exploitative factory owner wants workers to be somewhat healthy so that he can hire lots of them, and so that there will be more competition between prospective workers (which keeps wages down). And human rights seem like a prerequisite for maximizing a society's creative output. I suppose frightened and brutalized people can do agricultural or factory work, but I doubt they can do great physics.
As for human rights, it is important for producing creative work. However, the nature of creative work is that the results are indirect and unpredictable, and the benefits are usually spread beyond economic boundaries, which don't address the immediate needs of the poorer developing countries.