Some social scientists have identified eight stages to genocide. These stages help students break down any genocide. I use the "Harry Potter", which the kids are much more familiar with than the Holocaust or Cambodia, to explain the stages. Then, we look at real world examples and apply our understanding.
3. Dehumanization Mudbloods: Hateful slur against those of non or mixed magical families. “Halfbreeds” includes werewolves, merpeople, centaurs, wizard-giant mixes, etc. due to their half person/half beast appearance.
4. Organization Death Eaters organized. Recruitment of Dementors. Recruitment of Giants. Killing of Dumbledore. Infiltration of Ministry of Magic . Assassination of Minister Scrimgeour. Snape as Headmaster of Hogwarts.
5. Polarization Pamphlet: "Mudbloodsand the dangers they pose to a peaceful pure-blood society“ by Dolores Umbridge “Department of Mysteries discovered that Muggle-borns acquired their magic by "stealing" magic and wands from real wizards.” (wikipedia.com)
9. Denial Denial of Voldemort’s return. Character assassination of Albus Dumbledore and Harry Potter by Daily Prophet. Ministry drags feet under Scrimgeour.