Perhaps not. Lacking the skills and experience that make a large-organization-CEO, I don't think my inability to think up a strategy means much. I'm also not paid like a CEO. I expect the same applies to you, although I don't know that. Obviously, our collective inability means slightly more.
Not in public, no. However, he was a dick to them in private where he though it'd be safe. Prop 8 was about taking away a right that gay people had. They were already allowed to marry. This was about the majority ganging up on a small, persecuted group and taking things away from them by legislative fiat. The Constitution forbids this, as was later confirmed by the courts.
If Prop 8 had been about re-enslaving blacks, and he'd donated to that, do you think we'd be saying, "well, but he's nice to all the black people he works with!" It was morally repugnant to support Prop 8, and public acts like political donations do, shockingly, have consequences.
When we talk about "intolerance of intolerance" being OK, we're being a bit flip. What is actually meant by the phrase is that it's OK to make people act tolerant, even if they aren't naturally inclined to do so, in order to preserve a particular group's rights. They can hold whatever opinions they want, but they have to be civil. But Eich was already doing that. He was even one of the people who helped draft Mozilla's inclusiveness guidelines. This was just punishment because Eich held a particular opinion, not because he was actually having trouble tolerating gays in the organization.