[TAForObvReasons]

The leadership is expected to reflect and uphold company values, which may differ from company to company. Incidentally, we have a perfect case study with CFA and its COO (https://en.wikipedia.org/wiki/Chick-fil-A_and_LGBT_people refresher)

CFA's entire organization is built around family values and good Christian values. It starts from the ground level -- you can't become a manager without the company checking your friends and family. So that type of sentiment pervades the organization. The comments and donations were mostly in line with company culture. This isn't to say every CFA employee was anti-gay-marriage, but they value family enough that it is plausible that the employees would support the COO.

Mozilla is the opposite situation, emphasizing diversity and trying to cater to the (generally more socially liberal) tech community at large. Eich's donations flew in the face not only of the values Mozilla were trying to espouse, but also directly affecting a nontrivial number of its employees.

If Mozilla had the culture of CFA, Eich wouldn't have been removed. In order to uphold their image, Mozilla couldn't have kept him.