Here's the writing on the wall that I think is being ignored: google has thousands of employees, with all types of opinions. I guarantee you some of those people have controversial opinions, and some of those people share those controversial opinions.
Everybody blames the author for creating a disturbance, but you can't create a disturbance without people being interested in what you say. The fact that it was so widely circulated (instead of ignored like 99% of blog posts) suggests to me that a number of people at the company feel like he had some really good points.
It's scary to me that the "safe space" crowd gets to define what views are offensive, and inherently make it an unsafe (even firable) place for those who disagree to express who they are and what they believe.