Irrelevant - it's a stated organisational value. https://wiki.mozilla.org/Diversity_and_Inclusion_Strategy
> Can any organization declare inclusivity as one of its core values
Yep.
> and start enforcing it by firing every person in position of power who holds an exclusionary view on any subject?
In the US, probably, although it may depend on which state and precisely which exclusionary views are in play. In the UK, maybe, depending on what those exclusionary views are.
> But by that logic, you hold an exclusionary view
I do, yes. Well done! I hold many exclusionary views but they are all targeted at people who people who want to exclude or hurt others for what I consider bullshit reasons.
> "All must prove their purity and loyalty or be excommunicated."
Nonsense.
> You don't want to be discriminated based on your opinions
I am 100% behind discriminating against people who hold opinions that another class of person is lesser than them.