You're right, they should be - but that's not how they were or are represented, and that's part of the lie. Saying, that it's so obvious that everyone ought to have realized that anyway doesn't justify it.
I'm not justifying it. Im showing it's normal and understandable. I am thus saying that those who think or believe it's not are deluded.
If you believe an organization should or does give a 100% or even 90% acurate historical record then you have a false belief and thus keeping that belief makes you deluded and surprised and upset by it.