With that said, I thought that the article's title was kind of ironic because in my opinion, the intersectional identity politics espoused by the authors is itself one of the most toxic aspects of contemporary tech culture. It's the part of working at a mature venture-funded startup in SV that I miss the least, by far.
B) Would you be willing to clarify what was toxic about your experience with SV startups as you described?
C) Realistically, without denying the problems which probably do exist with "intersectionaly identity politics", etc, it seems pretty clear (as in there are studies, etc) that sexual harassment is one of the most toxic aspects, not only of tech, but of contemporary business and American life. Discrimination based on the color of one's skin is up there as well. So it does seem a bit disingenuous to point out the flaws in ways in which people are trying to ameliorate these problems without acknowledging the problems themselves, and/or to imply that said flaws are more pervasive than the damaging behaviors which they are a response to.
I think there is independent merit to removing people who are terrible, even if doing so deprives the company of an incredibly valuable asset--e.g. firing your mythical 10x founding engineer because they're harassing other employees and making them feel unwell/unsafe, even if it severely damages your company's ability to produce. This is because growth and profit are not--and despite the "100% meritocracy free market" advocates' arguments, never have been--the sole aims of a business.
Businesses exist within a broader community; they aren't optimizing for widget creation in a vacuum. The rise of intangible/cultural reasons for punishing a business in the court of public opinion (uber; those scandals didn't highlight things that directly impacted the company's bottom line, but rather things that were unacceptable ethically to the broader community, or things that might have, given time impacted the bottom line) speaks to this; so does the decrease over time in Tamany Hall/Boss Tweed-type abuses of employer authority.
In short, for a business, acting ethically has an objective value which is independent from (or, if you want to nitpick "independent", at least has primary influence on) profit/growth.