Judas in Jesus Christ Superstar is a bit different than "life of Christ" interpretations generally are. His is the voice of reason. What reason did he have to believe Jesus was the son of God? All he had was his word. Judas is the main narrator of the story. We're supposed to identify with Judas. So by coming from his lips, these words are intended to be the thoughts of the onlooker, which makes it so much stronger!
I'm sure that's why Judas is black. The director assumed that racist people are also the same dogmatic idiots who cannot reconcile the idea of reinterpretations of the Bible. By making Judas black, it'll go right over their narrow minded barely functioning heads. Maybe that's why nobody reacted. It's a theory.
I love it BTW. It's the singing and music. I'm not really interested in critique or attacks on Biblical myths. Why bother? Musicals rock!
Maybe I'm a screaming queen at heart... Maybe I'm so far into the closet I don't even notice I'm in it!