I just watched Mr. Damore's video interview complaining how Google betrayed him and all he wanted was to make Google a better place. It sounded like his strongest running argument for this gender gap in tech/engineering space was the testosterone hypothesis and used some of the evidence presented in Ms. Doh's this opinion piece. He also asserted that Google was an echo chamber and conservative views were shunned. hmmm.... it is all making sense now: by Mr. Damore's own logic, perhaps the conservatives biologically less equipped to work in engineering jobs - another perfect study topic: "in-utero testosterone exposure and political tendencies." Of course, we know it is ridiculous because just like women and other minorities, the conservatives may not choose to work in silicon valley where they don't feel accepted. Sometimes, one needs to take few steps back, see the forest, and acknowledge one's own biases. 
Kudos to him though for starting an open conversation..... once AGAIN! :-)