I think that you will find a lot of what is practiced is so diverse that there was a hesitation to make blanket rules, as different situations call for different approaches to magic. In short, while we might all have our own prejudices for or against certain types of magic, we do not allow any one person to make sweeping generalizations forbidding one kind or exalting another. This seemed to be the only fair approach.
And luckily, if any one magic-practitioner is an ass, there are many of us to counteract them.