The originally white character Perry White (...) is portrayed by a black actor in Superman vs Batman. Same goes for Johnny 'The Human Torch' Storm, Shield's Nick Fury and even for Harry Potter's Hermione who was played by a black young lady in the stage play. Is it a bad thing, that a originally white character is played by someone with a dark skin? Of course not!
But imagine the controverse when a movie about Muhammad Ali lets the audience see him as a white dude.