British People Grasp The Magnitude Of The Problems Their Governments Have Caused, page-364

Just from a quick flash, I know of 4 from history. I'm sure there are many more.

Nakba, not properly reported and/or hidden by history. I only became aware through this current Gaza unfolding.

Nanjing, committed by the Japs but they became a useful allie against the Communists hence absolved from any punishment.

Rwanda, we in the West didn't want to know because of the US Somalia humiliation prior, you can find a European UN general pleading for more troops and assistance.

Holocaust, the most famous and a constant reminder of his Hitler went about the Final solution.

And now we have another in the name of self defence. This current cannot bypass social media.