Grey Magick Options

Greetings all of SM ~
I've come to ask a question on "Grey Magick", regarding the various outcomes that would lead to it either being white or black. As I've heard many examples as to how different spells can in turn become w/b, I've yet wondered in great detail if other variables of performing any spell can in turn overcome the initial goal and turn that spell into the opposite sort of magick.
I'm not entirely sure if this statement clarified my question well enough so I'll provide an example. Let's say perhaps you perform a spell to help a stranger come out of a coma, a coma that this stranger would never wake from, with no other background information on this stranger whatsoever, you decide being in a coma is just a terrible thing to endure in the long run. You run the divination process to put your mind at ease of what you want to accomplish and it turns out you have the green light. In this case, divination has told you no real negative influence has befallen your wish to return the stranger to his health. You go through with the spell, the man awakes and all is well. Two years later you understand this very stranger woke up one morning and decided to grab his own personal automatic rifle and go down to a super market and wreak havoc on 12 other lives before turning the gun on himself.
Now, I'm currently not a practicing magician. Perhaps, divination would enlighten you to events like this, though theres also so much the divination process can tell you about what you currently want done. Is an example like this accurate? Can it be? If so, to what incentive do the rest of us have to continue with magick if it will have unknowingly dramatic feedback.
I base my life on, everything having a purpose, every action causing a reaction that can potentially be bad or good. Even though I do a lot of good in my life through natural means, Im not going to truly know if that bit a good I just did, will take a turn for the worse. Is this how we're supposed to view magick?
Please, put my mind at ease. Thank you all in advance. (IMG:style_emoticons/default/egypt1.gif)

I tend to with the magick is all neutral camp. The analogy I use is a lake. The lake is full of water. It gives life to many animals, yet many also drown. Does that make the lake good or evil? Its just a big ole puddle of water. It has no value of being good or bad. So what I do is seperate magick from intention - because thats the real debate. Magick itself is neutral but it can be used for "good" or "evil" intentions. The difference between white and black magick is not the magick, but why it is used. The problem here and why it becomes a slippery slop is that good and evil are relative terms that mean different things to different people. Thus what is white or black magick to you might not be to some one else. Then perhaps the difference between the two is the conduct of the individual.