Does anybody else marvel at how gullible people are?
This isn't about being gullible. It's about working your way up the ranks.
In an authoritarian regime (which includes most companies), the greater the horror you countenance, the more impressive your demonstration of loyalty.
Once all the awkward, conscientious-objecter types have been weeded out by tests like "will you accept an abusive male in charge of rape crisis services?", you're left with loyal conformists. And they know they'll all have each others' backs. They're all mutually complicit. No awkward whistle-blower types left.
Occasionally you do have trouble-makers clinging on, like Sonia Appleby at the Tavistock, but very few individuals have that strength of character. Most will leave voluntarily rather than keep fighting.