[Barrin92]

>It sounds like justification for a “slave” class to do undesirable jobs

It's the exact opposite. The slavery is being trapped in Cuba which the person decided to leave by their own free will to make it to America, where working a terrible factory job is going to make them ten times richer than they would have been otherwise.

Is you being uncomfortable with this idea actually more important than giving that person a shot to work himself to a normal American life within two decades and certainly for their kids?