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@Valorum But if it is not the antagonist of the episode, then who is? By targeting innocents it was opposing voyager (morally, if not physically, although I'd call taking them hostage pretty antagonistic!), and the fact that it was ultimately defeated by persuasive speech rather than superior firepower merely makes voyagers victory all the more impressive, to my mind.
Except that witches and wizards have magic. They don't need to buy sticks for e.g. kindling - they can a) conjure them if needed, b) not need them in the first place because they have magic fuel-less fire, or c) steal them from muggles (which is legal by wizarding law).
This doesn't answer the question - just because an item is on the Registry of Proscribed Charmable Objects, doesn't mean that a muggle could use it. Similarly, your first example doesn't show that a muggle activated it - in fact, given the way the teapot reacted, I'd say it's more likely it was enchanted to react to muggles, than that the muggles activated it and somehow reprogrammed the magic.
Note that the slayer line was also created by bonding with a demon, but Buffy is never referred to as a demon or half-demon herself. Maybe it's a semantic thing, just calling cordelia "half-demon" because "human partially possessed by bonding with a demonic spirit capable of transferring supernatural attributes" was a bit long for everyday conversation... :p
