Why Can Johnny Depp Play Tonto, but Ashton Kutcher and Sacha Baron Cohen Get Slammed?

Why does Johnny Depp get adopted by the Comanche for his Tonto role while Ashton Kutcher and Sacha Baron Cohen get ripped for their racially charged characters? ?Hella Johnny, via...

Source: http://feeds.eonline.com/~r/eonline/answer/~3/-noPVR9o_YU/why-can-johnny-depp-play-tonto-but-ashton-kutcher-and-sacha-baron-cohen-get-slammed

Rosario Dawson Rose Byrne Rose McGowan Roselyn Sanchez Rozonda Thomas