> I won't be able to ever understand why historical persons in the movies should be black even if they couldn't be black in that position at that point of history.
If they are historical persons, they either were or weren't black. You are probably talking about fictional persons in more-or-less historical fiction. And both inclusion that minimizes the racism of the historical period and exclusion are potentially seen as problematic (from the Left; obviously, you’ve kind-of articulated the Right objection to inclusion.)
Of course, whitewashing by placing White characters where they make no historical sense, often simply inserting white characters into adaptations of existing stories from other cultures (especially in lead roles) is still (not only historically) more common than implausible inclusion of non-Whites, and remains a big complaint by (AFAICT) lots more foreigners to US media than occasionally including black people in improbable historical positions.
If they are historical persons, they either were or weren't black. You are probably talking about fictional persons in more-or-less historical fiction. And both inclusion that minimizes the racism of the historical period and exclusion are potentially seen as problematic (from the Left; obviously, you’ve kind-of articulated the Right objection to inclusion.)
Of course, whitewashing by placing White characters where they make no historical sense, often simply inserting white characters into adaptations of existing stories from other cultures (especially in lead roles) is still (not only historically) more common than implausible inclusion of non-Whites, and remains a big complaint by (AFAICT) lots more foreigners to US media than occasionally including black people in improbable historical positions.