It seems that wizards and witches have more rights compared to anyone else (muggles or other species), which sounds quite worrisome. All in all, segregation is a very serious issue in the wizarding community, thus it is not surprising at all that it is filled with internal tensions.
Fake news are like religion, you must believe them despite of all common sense and evidence to the contrary. Like any radical religion, it must be protected at all costs. And so, in the fifth volume, Dolores Umbridge made Harry write lines, etching them into his own skin, saying: “I must not tell lies”.