What is Reddit's opinion of The Nazi Connection: Eugenics, American Racism, and German National Socialism?

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Eugenics is actually a little more nuanced than you are making it sound, or at least, many, many different American social and political groups in the early 20th century advocated for opposing doctrines of eugenics. The eugenics movement has been utterly discredited after WWII, but you're oversimplifying the history of the movement. It was certainly a popular movement that many self-respecting statesmen, scientists and businessmen also fervently believed in.

I can not find a reference for the quote you mention anywhere. This book: http://www.amazon.com/The-Nazi-Connection-Eugenics-Socialism/dp/0195149785/ref=pd_sim_sbs_14_2?ie=UTF8&refRID=132C50MXYBXY9NTE9CQQ is one of the most thorough looks at the relationship between American eugenicists and the NSDAP, and does not mention Sanger anywhere in the book. There is simply no connection between Planned Parenthood and official Nazi racial policy, as far as I can see.

Read Stefan Kuhl's book on the subject.

https://www.amazon.com/Nazi-Connection-Eugenics-American-Socialism/dp/0195149785