> I'm sorry you don't get it but most people wouldn't want to work with such a socially maladapted person who could compile all this research
By "most people" you mean "myself and a couple of my friends who I didn't even ask but I am sure I know what they think because we all think the same". Actually, working with a person who bothers to support his opinions with well argued, well searched and well presented research, instead of running to the press crying "witches! there are witches here! burn them all!" is a very pleasant and productive thing. Even if you disagree with such person, at least you can have a civilized discussion, understand and appreciate their arguments and eventually hopefully find common solutions, and you have a reason to expect they'd behave in the same reasonable, professional and civilized manner. On the contrary, working with somebody who would each time you do something they don't like leak it to the hostile press who would sensationalize it and coordinate personal attacks on you would be a complete nightmare.
I'm sure if you lived in a very religious society, you'd have the same condemnation of anyone who openly questions the Bible. Your concern isn't that he was wrong but that he shouldn't have said things people clearly didn't want to hear. Social conformity is pretty useful at keeping people working cohesively and effectively, but it can go astray and we need people brave enough to fight against it when that happens.
> things they clearly believe
I think this what angered people the most. What he actually wrote was reasonable and factually accurate, however, others who were also socially inept but in a more typical way read between the lines and imagined some other unstated bad ideas must be in his mind. Back when this happened a lot of people were making angry posts about these imagined ideas rather than what he actually wrote. He must believe women are incapable of working in tech, inferior, etc.
It's weird, I'm sorry you don't get it but most people wouldn't want to work with such a socially maladapted person who could compile all this research pointed at <20% of the company's employees, not put their name to anything of substance, shy away from expanding on other things they clearly believe wrt racial diversity, suggest ending all diversity programs at one of the most prestigious and competitive tech companies because of a collection of averages despite saying nothing of substance should be extrapolated from them on an individual level, then spam everyone in the company's inbox with their manifesto.