Answer:
wanting to disguise the truth they have uncovered.
Step-by-step explanation:
Historians and any researcher can unfortunately intentionally distort some records.
In the case of distortion, illegitimate techniques can be used and presented as a proper historical document. If original genuine documents are changed, and manipulation of statistics or mistranslating sources ; all of the mentioned will hide the facts.
For better clarifying, some of the topics like -Holocaust denial have been manipulated, much like the Soviet crimes denials, or the Armenian Genocide.
Some organizations make worlwide surveillance on promoting conscience on these events so they wont be denied.
In all of these cases, authors deliberately carry an effort to present information as legitimate while their interest is politically or interested based.
So historians sometimes will be unwilling to accept the truth or reject it and will find a way to convince themselves of something else.