Publicly stating your opposition to a contentious issue your company is facing isn't exactly an easy thing to do. Workplace marginalization is a real thing.
It's pretty common at Facebook. Andrew Bosworth repeatedly writes about the importance of malcontents, and there are many employees who repeatedly push back on leadership. This takes place almost entirely on Workplace.
I'm not sure why this is getting downvoted. This is correct.
I've never worked somewhere where challenging leadership is so encouraged.
Don't you think workplace marginalization would cut the other way? If you have 250 people angry enough about this to leak to the press, imagine what they'd do to their fellow employees who oppose them.