Thank you for asking me to describe the image. The historical event is the holocaust. There have been other hate-based genocides. The US Holocaust Museum website says, The image I posted is called the pyramid of hate and it suggests that a society starts with bias and prejudicial attitudes which can develop into discrimination and perhaps genocide. Here's another version:Are you saying that the author is analogizing the actions of the US with this historical event?
Genocide is often preceded and accompanied by widespread hate speech. The leaders who planned mass killings in the Holocaust, Rwanda, and Srebrenica disseminated ideologies of hatred to spur their followers to act, to cow bystanders into passivity, and to justify their crimes.
My Crusades prof alluded to some theory drawing a line between previous slaughter in Germany and the Holocaust. Will have to get home to edit this comment with its name.