My guess would be that the wizards and witches in HP fear both chaos and a new batch of witch hunts.
The magic in HP, as Fordim says, follows the general perameters of "if you say this and do this, THAT will happen". That's scientific. However, I don't think Rowling's story telling limits ALL the magic to quite that. Well, perhaps it does, but still she is able to pull off WONDER, which rates pretty high with me.
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