The people of Sighet, like many Jewish people in Europe at the time, are naive and unable to believe the atrocities being committed by the Nazis.
When Moshe returns to Sighet and tells everyone about what he experienced, they are unable to believe him. Instead of believing him, the people of Sighet say he is crazy. If they were to believe him, they would have to admit the fact they were in danger as well. They do not believe until it is far too late to leave.
