Clinton said: The good witches dress in white, look pretty, and have a munchkin fetish... the bad witches dress in black, have green skin, and melt in water.... These are physical characteristics, and have nothing whatsoever to do with behavior patterns definable as "good" or "bad." Are you defaulting to Walt Disney's definitions? Do you mean the behaviors attributed to the men and women hanged in Salem Village as witches (and whose executions were condemned by Cotton Mather)?

My Webster provides the following definitions:
1. a woman supposedly having supernatural power by a compact with the devil or evil spirits; sorcerous.
2. (Obs.) a man with such power.
3. an ugly and ill-tempered old woman; hag
4. (Colloq.) a bewitching or fascinating woman or girl.

Personally, I can easily believe in Webster's numbers 3 and 4, and they can be either good or bad.