Name(s):
Refusal to apologize for mistakes
Failure to acknowledge failure
Incidence
It was reported in 2000 that the Roman Catholic Church was divided over a report called [The Church and the Faults of the Past] which seeks forgiveness for past "sins", including the Crusades, witch-hunts of heretics and the Inquisition.
Counter-claim
Anachronism is the worst sin for a historian.