The third option -- to escalate the argument to the public square and enlist the public as allies -- is available, but think what would happen if everybody did this. In a company of thousands of people there will always be passionate disagreement. If companies tolerated this kind of public escalation, it would erode the trust that is necessary for any organization to operate. It would be its own kind of toxic culture.
I mean, being silent about company dirty laundry is not exactly virtue.
If you're leaking about something that's genuinely concerning (criminal, or just very bad and immoral), by all means, leak it.
But this seems more of a leak to make some noise, to win an argument by public opinion. Nothing but a political stunt. Not very virtuous.
It's not a political stunt. The people who haven't left clearly want to remain their for various reasons asides from the issues they expressed. It's an attempt from those employees to actually improve the company and address the issues they have.