the use of lunar phases and its energy to .....assist in spells .
---Witches know better than anyone that energy moves in cycles. Some nights the moon shines bright, and some nights the moon is shrouded in darkness. It would be completely unnatural for the moon to appear the same each night. Witches use lunar energy in all its phases—both light and dark. The energies are very different, but neither is better than the other. There is a place for both of them in witchcraft.
From my reading, and to add to what Nightwatch says, some say that there is no black and white in Witchcraft, only gray. No real evil, no real good. And in Wicca, everything you do will bounce back at you like a boomerang, magnified 3 times 3.