Why did he have trouble finding a publisher?

When he finally broke that silence, he had trouble finding a publisher. Such depressing subject matter.

When Night was finally published, over twenty-five years ago, few people wanted to read about the Holocaust. Such depressing subject matter.

But we cannot indefinitely avoid depressing subject matter, particularly if it is true, and in the subsequent quarter century the world has had to hear a story it would have preferred not to hear-the story of how a cultured people turned to genocide, and how the rest of the world, also composed of cultured people, remained silent in the face of genocide.