They didn't believe/We'll Never Forget: Night

The village pauper warned the Jewish shtelt where Elie Weisel grew up that the Germans were exterminating people.  He warned them to leave and they thought he was a madman.  The Hungarian police officer who was friends with Weisel's father knocked on the boarded up window to warn them, but by the time the family pried the boards free, he was gone.  The entire village lined up, placidly, cooperatively, even cheerfully at some points, for their slaughter.  The innocence and disbelief may be one of the greatest tragedies of this story.