Look, put simply, people should not be comfortable saying that in public and the way to fix society runs directly through making them afraid to say it again.
In the wake of Arday's death, Nathan Cofnas (who led the X mob against him) states his motivation. Beyond whistleblowing, he states that after a 'revolution' removes professors like Arday, it will open opportunities for him to become 'head of the department of eugenics and race science at Harvard'.