The idea of evil is always subject to denial as a coping mechanism.

They feel guilty for having survived so they pretend the bad things never happened
Exodus (1960) screenplay

DENIAL OF EMOTIONS
Our culture does not handle emotions well. We like folks to be happy and fine. We learn rituals of acting happy and fine at an early age. I can remember many times telling people "I'm fine" when I felt like the world was caving in on me. I often think of Senator Muskie who cried on the campaign trail when running for president. From that moment on he was history. We don't want a president who has emotions. We would rather have one that can act! Emotions are certainly not acceptable in the workplace. True expression of any emotions that are not "positive" are met with disdain.

Perhaps nothing so accurately characterizes dysfunctional families as denial. The denial forces members to keep believing the myths and vital lies in spite of the facts, or to keep expecting that the same behaviors will have different outcomes.
Dad's not an alcoholic because he never drinks in the morning, in spite of the fact that he's drunk every night.

Playing roles and acting are forms of lying. If a person acts like they really feel and it rocks the boat, they are ostracized. We promote pretense and lying as a cultural way of life. Living this way causes an inner split. It teaches us to hide and cover up our toxic shame. This sends us deeper into isolation and loneliness.

Perhaps nothing so accurately characterizes dysfunctional families as denial.