That's a complete fabrication. You are referring, of course, to the St. Louis. The St. Louis did NOT return to Nazi Germany. Virtually all the Jews on board went to France. France, in 1939, had the largest, most modern and best equipped army in Europe. With the gift of hindsight, we now know that France would be conquered by the Germans. But nobody knew that in 1939. Refusing to accept illegal immigrants, and instead turning them over to a friendly government with an army of 1.5 million hardly seems like abandonment.
Moreover, in 1939, the Germans were still mainly harassing and trying expel their Jewish population. This was still three years before the Holocaust began.
You may be hard-headed but certainly not brainwashed or simian. Good contra-counterfactual realism to your posts.
The ship was turned away from the U.S. with the knowledge that the passengers would probably be forced to return to Germany. Only after it got back to Europe were the refugees distributed about evenly among France, the Netherlands, Belgium, and the U.K. Those in the first three countries largely died in the Holocaust but as you said, that wasn't predictable.
The U.S. didn't turn over the refugees to France, it simply washed its hands of them without concern for what would happen.