Rose washing

The process of changing the events of a story or history to make it appear more pleasant than reality at the expense of the cold hard truth.

Often to present an agenda in misleading facts to make some historical events or periods more attractive to modern audiences. Downplaying unethical choices made in the past.

Or seen in movies and TV, where producers ignore original source facts to construct a story of their own liking. For instance:
Turning as novel about both sides in a war committing atrocities to good guys vs bad guys, establishing a clear direction in narrative to influence audience bias.

I can't believe they are rose washing the story of Alexander Hamilton! They ignored his contributions to slavery!