This process of self-censorship is ubiquitous and that those who do it believe that they are doing the right thing. That they call it "sensitivity" and "fairness" review without realizing that they are censoring to placate pressure groups, or in anticipation of protests.
Most people believe that schools were good enough when they were children and that they are good enough now. But the dynamic growth of our system of education has spawned serious problems of educational quality.