It helps to see all this before. Because its exactly the same. At that time I was so shocked to see these arguments, and it helped me to read more about denial during the Tutsi Rwandan genocide. I also talked to my friends who told me about the Mayan genocide in Guatemala, and how they couldn't speak to their families and friends. They told me that people will continue to deny even when perpetrators are taken to court and there are mountains of evidence.