Malcolm X was a dynamic person, a very special human being who might have caused a revolution. He had to be done away with. The American government couldn't let him live. If 23 million blacks found a charismatic leader like he was, they would have followed him. The powers that be couldn't accept that.
I think it's an actor's responsibility to change every time. Not only for himself and the people he's working with, but for the audience. If you just go out and deliver the same dish every time ... it's meat loaf again ... you'd get bored. I'd get bored.