Exploiting the third world part of America is also good for business.
They are third world because they are ignorant. And they are ignorant because they are third world.
Sometimes small incentives go a long way toward getting people further ahead. Sometimes they may shine by means of sports. But not everyone can be saved by sports. :-)
Mental illness, trauma, stress, physical disability / injury, side effects of living in a bad neighbourhood / neighbourhood targeted by law enforcement, trends in the local economy, etc. are some of the multifaceted reasons that people and families end up in poverty.
If I knew your philosophical leanings I could construct an example that would be quite common -- but for all I know you think it is not exploitation to offer jobs for minimum wage with no benefits that offer only 19 hrs a week of work (no benefits) but demand 24/7 availability.
So let me use a more extreme example. When individuals are suspected (NOT yet proven) of illegal immigration they are sent to a detention facility. There they are not allowed amenities like fresh socks or telephone calls unless they work for them at the rate of $0.13/hr. This is happening today to many thousands of people (http://www.npr.org/2015/07/23/425511981/at-low-pay-governmen...).
Surely THAT counts as exploitation.
I bet the excuse (if an excuse exists at all) is the obvious "nobody is forced to work"/"we provide (bare minimum) amenities to anybody that wants them" circular reasoning.
The immigration issue is a different thing entirely.