The Nolan movies are good movies but I don't like Bale's Batman, it's the voice, I have no idea what Bale was thinking, it sounds ridiculous.
Probably was Bale was thinking was "This is what Chris Nolan wants, so this is what I'll do." If it had been Bale's idea and Nolan hadn't agreed, then Nolan would've had him do it differently. So the voice is what Nolan wanted it to be. The buck stops with him.