Magick is magick. it has no color, though it does have intent and energy. Though we view healing, happiness, luck magick etc. as "white magick", and magick to harm as "black".. Who's to say that the luck/ prosperity spell you just performed meant that the $100 bill you just found was someone else's loss. Or that spell to spike your career caused someone else's theirs? Doesn't sound so positive now does it? Or performing a "black" magick rite to keep a person away from you, to protect yourself from mental/emotional harm? Its the intent that matters. It's if you're out to harm someone, have ill will, or to be at peace.
Magick is a manipulation of energy to aid us in parts of our lives. And the results vary of course. But every action has a reaction, and that is the law of nature, to maintain a balance.