It's not changing history, it's removing things from uncontrolled public consumption that are offensive and oppresive. Because it was allowed then doesn't mean it was right, it just means the people it was offensive to had less of a voice.
History is found in places where the context and meaning can be explained, like books and appropriate shows, articles etc. Not just some guy using the N word in a sitcom.
It's not changing history, it's removing things from uncontrolled public consumption that are offensive and oppresive. Because it was allowed then doesn't mean it was right, it just means the people it was offensive to had less of a voice.
History is found in places where the context and meaning can be explained, like books and appropriate shows, articles etc. Not just some guy using the N word in a sitcom.