My example is not the most terrible, but it's still so strange to think about...
20 years ago, before the Iraq War began, there was a bunch of fake intelligence, aluminum tubes and the CIA, and Colin Powell got on TV saying the war was necessary, but it was all a bunch of lies, and any smart informed American would have known. I did my part and protested and spoke with dozens of people trying to convince them that they were getting played. Unsuccessfully. That's not the strange part.
The strange part is that after the war started, it was revealed that all of the stated reasons were wrong. The facts came out, and my position was vindicated. Obviously it wasn't just me, but I'm focusing on my personal experience. So you might expect that some people would be embarrassed or upset with the government or the media. After all, that war killed large numbers of people. But no one that I spoke with before the war started ever showed signs that they understood that they had gotten it wrong. Why not make an about face, why not blame the media or the president? It would be so easy to find some integrity, but apparently it's easier to pretend that the past didn't happen.