Maybe they have dug in for purely emotional reasons now, and need some shareholders to set them straight. Or maybe there even are enough shareholders that value behaving ethically more than money. There’s no law of either governments, physics, or human behavior that prohibits that.
I guess there is a tradition of deference to corporate leadership, especially among institutional investors. But there have been cracks in that consensus, with for example Blackrock (the largest of them) making more noises wrt such issues (trade in weapons, climate change, etc).