[theorique]

Been chewing on this since you made the comment, and I don't think I buy it. The "legal issues" angle is a dirty cop-out, and it ignores the issue at hand: he's being suppressed for holding an opinion.

He's not being suppressed (and now fired) for holding an opinion. He was fired for publicly expressing views that were incompatible with his job as CTO.

He said in a public medium (Twitter), tagged with his professional title, that he believed superb female developers were as rare as unicorns. Any woman who had ever interviewed and been turned down for a dev position at Business Insider might have a legal case for unfair discrimination in hiring.

The other stuff (racism, sexism, etc) is one thing, but the example I mentioned above exposed his company to legal liability. That's not a responsible thing for a person in a decision-making and hiring position to do.