Cognitive dissonance is a thing.
You also have to remember… that once they got out of the war, their INDIVIDUAL EXPERIENCES would have blended into what they say on MSM. MSM wanted everyone to believe that there were gas chambers and that the Germans killed 6MM Jews.
Now, if you could go back in time and find someone who had NEVER had a television or a newspaper after the war and ask them exactly what they experienced in the concentration camps, it's a totally different story than what all of these people that are alive today and have been programed what to think for 70+ years. Can you remember what you were doing as a 5 year old? a 4 year old? Yes… you know that you never saw your parents again and you have a tattoo to show for it.. but do you HONESTLY know what happened? The individual experience is so narrow and focused that it's impossible to see the entirety of what happened without factoring in the MSM lies.