I asked for empirical evidence that these initiatives had led to bad results at Google. If the biological research so directly contradicts Google's aims with these diversity initiatives, then we should be able to measure the negative impact, no? That Google has had these initiatives for years and still has ratios nowhere near the 50% that the author fears is a harmful goal, belies the notion that Google is conducting its recruitment in a reckless, diversity-at-all-costs way.
Of course having read the memo, I know that the author does not cite any such empirical evidence, besides begging-the-question anecdata such as "I've gotten many personal messages from fellow Googlers expressing their gratitude for bringing up these very important issues". While I believe the author to be smart and am willing to give him the benefit of the doubt about being sincere, I question how he can fill 10 pages with observations and boilerplate (including a trite table of what he thinks "left" and "right" biases are) and not be able to mention actual observed consequences of Google's hiring practices having gone awry. It suggests to me that he hasn't really been openminded or willing to investigate both sides of the issue.