Here is my view on the 'good magic' argument. I may be wrong, but this is what I have gathered...
'Magic' comes from evil. That is why there is no such thing as a good Wizard. For, witchcraft and such comes from satanic powers, and therefore cannot be good, and no magic can be used for good because evil won't let it's own power go against it. There is a story in the Bible that explains this nicely.
Quote:
22 Then they brought him a demon-possessed man who was blind and mute, and Jesus healed him, so that he could both talk and see. 23 All the people were astonished and said, "Could this be the Son of David?"
24 But when the Pharisees heard this, they said, "It is only by Beelzebub, the prince of demons, that this fellow drives out demons."
25 Jesus knew their thoughts and said to them, "Every kingdom divided against itself will be ruined, and every city or household divided against itself will not stand. 26 If Satan drives out Satan, he is divided against himself. How then can his kingdom stand? 27 And if I drive out demons by Beelzebub, by whom do your people drive them out? So then, they will be your judges. 28 But if I drive out demons by the Spirit of God, then the kingdom of God has come upon you.
[Mathew 12: 22-28]
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So, by the same token, Gandalf comes against evil, not with magic and witchcraft, but with the power of the Valar. Harry Potter, on the other hand, comes against evil, with evil. So who wins? Evil, of course. "Every kingdom divided against itself will be ruined", so it makes sense that, rather than witchcraft, Gandalf uses the power given to him by Eru as an Ainour, and the power bestowed on him by the Valar.
That's what I think anyway. And may have been Tolkien’s bases for Gandalf... then again, it may not be...