A highly visible man in tech praised the writings of a mass murderer. The writings in question encouraged and led to violence against women through the viewpoint that women should pay attention to men and given men what they want all the time, along with a barrage of woman hating comments. This problem of entitlement and misogyny from societal influences is also well known, and is pervasive, in tech. Mahbod praised the writings of someone who represents problems in society that lead to violence against women. He threw in his own misogynistic comments for good measure. He's not only encouraging dangerous behavior, but adding to it. Women, both in technology and outside of it, feel a real danger because of comments like these. No amount of apologizing would have sufficed here to keep his job.
I was personally disappointed that he was allowed to resign, as that's not sending the right message, which would be "this is a real problem, we acknowledge it, and we won't tolerate behavior leading to violence of women." The firing is more appropriate. However, when you have someone like that leading a company, chances are it's already worked its way into the culture. I never had a reason to use this service before, but now I have a reason to actively avoid it.