When I was an ad coordinator for a large supermarket chain, I saw a woman fall over a pallet in the frozen-food aisle. It had no business being there. When the manager asked if I saw anything, I lied and said no. While there is seldom an affirmative legal duty to report wrongdoing, having been asked about the fall you ought not have lied. And if this episode became a court case and you were called to testify, you certainly wouldn't want it to become a matter of perjury.
Judges can be so crotchety.
I'm mindful that some vulnerable employees may put their jobs at risk if they report wrongdoing. The friend I was with said what I did was wrong, but I think I was simply speaking out against an evil. The fostering of social progress sometimes obliges one to jettison civility, but you seem to do so with an alacrity reminiscent of the French Revolution. It would have been ludicrous in 1850, for example, to urge Frederick Douglass to soften the tone of his abolitionist editorials in The North Star. In addition, one must match means to targets.