Just following orders, one supposes:

Truth about German diplomats’ collusion in Holocaust is revealed
Senior officials were willing participants in the Nazi campaign, says report published yesterday

Fuller WSJ story here (via Spotlight on Military News and International Affairs).  Related:

“Bloodlands”: Where WW II in Europe was really fought…

More on the book, and the mass murders of Stalin and Hitler, from Anne Applebaum in the NY Review of Books:

The Worst of the Madness
…

Stapleton Collection/Bridgeman Art Library
Soviet Foreign Minister Vyacheslav Molotov, center, arriving in Berlin to meet with Adolf Hitler, November 12, 1940. At front left are German Field Marshal Wilhelm Keitel and Foreign Minister Joachim von Ribbentrop.

Except neither Stalin nor Hitler was mad, far from it. Both were very intelligent and brutally logical men–within their own vicious terms.

Mark
Ottawa