When news spread that African American actress Halle Bailey would play Ariel in “The Little Mermaid” live action, the film received backlash. Some people could not fathom how a fictional character could be played by a young black woman. But there’s no reason Ariel couldn’t be black. There’s no historical accuracy to live up to here. Ariel is a fish person. Mermaids do not actually exist. Chill.