The first bit is just you wanting something to be upset about, and the source material for Oppenheimer was a non-fiction book about a real person.
And part of my point was precisely that 'respect the source material' is not a coherent concept when it comes to myths that are entirely fictional concoctions over the course of centuries, which have been re-told, re-mixed, and mish mashed many, many times over that period.
Was Wolfgang Petersen's Troy with Brad Pitt and an all-white, non-Greek cast faithful to the source material?
Re. Shaka Zulu - surely you understand how a) he was a real person, b) his race is central to him as a historical character, in a way that it simply isn't with Helen of Troy?
As a reminder, Helen a) didn't actually exist, b) was a swan or perhaps a goose, before becoming 'human', and c) was the 'daughter' of a god, who raped Helen's goose mother.