Mark Twain? Clara Clemens? Justin Kaplan? Harlan Ellison? Darrell Schweitzer? Apocryphal? Dear Quote Investigator: Famous author Mark Twain was grief-stricken when his daughter Susy died at age 24. The following expression of bitter despair has been ascribed to him: If there is a God, he is a malign thug. Oddly, no one has presented a …