History is not pure science though, sciencegeek. It is neither testable nor repeatable in the way scientific experimentation is. Take any event witnessed by 4 people and you will get 4 different versions. When those 4 different versions are recorded and subsequently reviewed by others others the number of different versions increases. None of them are revisionists in the sense you mean and none of the stories are 'garbage'. It's just the way the human brain works.