How can "@mozilla stands for openness" if you restrict who can run the company?
So you'd be ok if he was a racist? Brendan is entitled to express his views, but it doesn't mean they come without consequences.
This is not so far removed from saying Mary Jones shouldn't be CEO of Mozilla because she donated to a campaign against CO2 emission restrictions: Again by analogy with a settled political issue, "She's denying Global Warming. You'd be OK if she denied the Holocaust?"