Hans Fallada has been shunned by readers and critics because he didn’t leave Germany when the Nazis came to power. The reason why Fallada didn’t emigrate wasn’t, however, that he supported Hitler but simply that there are no other German-speaking countries in the world. And a writer can’t live outside of the language he writes in.
For Spanish writers who went into exile after the Civil War, it was easy. They just went to Latin America. Same language, same culture, easy peasy. But for Germans it was the same as for Russian writers who left in droves after the 1917 revolution but then all ran back into Stalin’s arms because even the knowledge of what awaited them there couldn’t defeat the need to by surrounded by the language again.