Lothiriel brought up a good point. The story of Aredhel falls under the category of the cause-and-effect relationships that pervade Tolkien's mythology; i.e. if this hadn't happened then this couldn't have happened...
Like all Tolkien's characters, Aredhel was necessary to set larger wheels in motion. She wasn't evil or bad, just the next ill-fated restless spirit since Feanor. Some of the choices she made weren't entirely smart, but nobody's perfect.
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The Dwarf breathes so loud I could've shot him in the dark, drunk, blindfolded and hanging upside down from a tree.
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