I was fired by Google this past Monday for a document that I wrote and circulated internally raising questions about cultural taboos and how they cloud our thinking about gender diversity at the company and in the wider tech sector. I suggested that at least some of the male-female disparity in tech could be attributed to biological differences (and, yes, I said that bias against women was a factor too). Google Chief Executive Sundar Pichai declared that portions of my statement violated the company’s code of conduct and “cross the line by advancing harmful gender stereotypes in our workplace.”

My 10-page document set out what I considered a reasoned, well-researched, good-faith argument, but as I wrote, the viewpoint I was putting forward is generally suppressed at Google because of the company’s “ideological echo chamber.” My firing neatly confirms that point. How did Google, the company that hires the smartest people in the world, become so ideologically driven and intolerant of scientific debate and reasoned argument?

We all have moral preferences and beliefs about how the world is and should be. Having these views challenged can be painful, so we tend to avoid people with differing values and to associate with those who share our values. This self-segregation has become much more potent in recent decades. We are more mobile and can sort ourselves into different communities; we wait longer to find and choose just the right mate; and we spend much of our time in a digital world personalized to fit our views.