Salvador Dali, Hieronymus Bosch, and John Heartfield photomontage to protest Nazism (url is http://germanhistorydocs.ghi-dc.org/sub_image.cfm?... ) called "Das ist das Heil, das sie bringen!" "This is the Salvation They Are Bringing Us!" (Here, the word salvation [Heil] is a pun on the Nazi “Sieg Heil” used in conjunction with the Hitler salute.)
The small print on the left is an actual excerpt from a Nazi science magazine extolling the BENEFITS of American carpet bombing. In short - it says carpet bombing is highly disturbing and will affect those already mentally imbalanced much more than the average person. These mental unstables will be more easily recognized and identified - in order to 'take care of them' - ( Nazi euphemism for killing any those who are not well enough to work.)
BTW Nazi Germany wasn't the first to "purify the race'
In the 20's there was a campaign for a "fit family' via the 'ideal baby' and the most 'fit family' from a eugenic perspective.
What this Americian display says is "SOME PEOPLE ARE BORN TO BE A BURDEN ON THE REST." and "LEARN ABOUT HEREDITY[...] YOU CAN HELP CORRECT THESE CONDITIONS."
Picture from http://www.savechicobabies.com/darwinism/eugenics/...