The wizards of Tolkien's world are angelic beings who appear to use innate abilities. Gandalf is no more a sorcerer (in the Harry Potter sense) than is the Balrog.
Once again you have failed to address the argument.
Argument (YOU): Harry Potter is bad because it demonstrates that magic can be used for both good and evil.
Counter-argument (ME): In LOTR, one wizard uses magic for good, the other uses it for evil.
Rebuttal (YOU): ...but you're wrong...
Further, You still seem to think that someone in the Harry Potter world can just sign up at Hogwart's and become a wizard. YOU CAN'T. You are either a Muggle or you are not. Harry Potter and his cohorts are ALSO using innate abilities.