The most famous forms of Holocaust denial and revisionism tend to focus on Jews, casting doubt, for example, on how many were exterminated in the camps. But denying the impact the Nazis had on the other groups they targeted, including queer and trans people, disabled people and Romani people, is still Holocaust denial. Maybe someone should tell J.K. Rowling.
People have the opinion that the climate isn’t changing. People have the opinion that the world is flat. People have the opinion everyone with dark skin is sub human.
Some people frame their terrible views as opinions so they can use the bad faith argument that it’s just a difference of opinions so everyone should just be ok with their hateful or ignorant stances. Some people frame their terrible views as opinions to try and avoid valid criticism of their opinions contradictions with reality.
You are fervently engaging in a behavior exhibited by the hateful and ignorant and there is a pretty safe bet as to why.