so actually i made the point. if ordered, elves can harm human beeings (or wizard beeings
) and not only if they are ordered: think about dobby, when he tried to keep harry out of hogwarts. anyway the ideea is there are no laws to bound them (i'm thinking now of the laws of robots in asimov's books). they are slaves but they can attack whenever/whoever. (but there already is a topic about this). and since their magic is different they might prove to be dangerous. the only thing is... there can be good elves too