Rand credited Peikoff with identifying "the cause of Nazism—and the ominous parallels between the intellectual history of Germany and of the United States".

[2] In 2013, parts of The Ominous Parallels were republished in a new work by Peikoff, The Cause of Hitler's Germany.

[3] German expatriate Hiltgunt Zassenhaus gave the book a positive review, saying it showed the importance of working to build a free society.

[4] In a Chicago Tribune profile of Peikoff, Rogers Worthington called it "a fascinating weave of German history, philosophic determinism, and Objectivist polemic".

[5] The reviewer for The Indianapolis Star found Peikoff's description of the parallels interesting, but was disappointed that his proposed remedy was Rand's Objectivist philosophy.