3rd Stone from the Sun

Recently I read this post about why white people make movies like Avatar. I found this amusing because I was wondering the exact same things while I was watching. The actress who plays Neytiri is black. The actor who plays her father is Native American, and the actor who plays her love interest is also black. The main character is white. I’m sure Cameron didn’t overlook these details. I loved Avatar. But really, why couldn’t the Na’vi people be played by white actors?