These activist employees enjoy psychological safety from taking on views that align with the political culture surrounding them - namely progressive far left political views that are common in the Bay Area, Seattle, etc. But the reality is, there are still many employees, both who are progressive and otherwise, that would prefer that the company take a nuanced, preferably neutral stance on these matters. They aren't speaking up because they are either busy or afraid of social/professional fallout (due to the prevailing views at these companies about Trump).
The only way to understand the true sentiment of the employee base is to take an anonymous poll of them, so that psychological safety is not an issue. Otherwise, what we'll see, and have been seeing at these big tech companies, is a tyranny of the vocal minority.