Answer:
A picture says more than a 1000 words
Step-by-step explanation:
When D. Lange made the photograph (1930s) the world was less accustomed to images than 90 years later. Photographs of human misery can still be very confronting but due to the (visual) information overload we are exposed to, we might not relate to it as much as we used to (or should) do.
There is also an interesting shift in the relation of the photographer and his/her object. As D. Lange remembered there was a sort of mutual interest (to help one another) when the Migrant Mother gave her permision for the picture to be taken. Nowadays it is has more layers: financial interests , protection of privacy and the abuse of other person´s misery are always looming in the background (of a photograph).
I remember a publicity campaign of a fashion company that used AIDS patients in order to reach its publicity goal. It would have been nice if they had showed a little more ethical consciousness... taking for example Dorothea Lange's work.