Why do some people think that acknowledging past political mistakes is important for preventing similar events in the future?

How would people who don't trust the government or "badge holders" respond to those who emphasize the importance of community and preparing for emergencies?
Are there historical examples of political support becoming socially unacceptable, and what can they teach us about the current political climate?
Why do people say so much that adultery is normalized in Japan? They keep saying that their concept of cheating is different.