Another interesting thought just occured to me. Galadriel too had desired to use the ring to overthrow Sauron. However, she was able to resist this. Galadriel saw the same desire in Boromir, and perhaps just wanted him to confront it like she did. Thinking, that if the ring just lays "dormant," within Boromir, only more trouble and doom would arise. She wanted to have Boromir confront his desire, in hopes that he could succeed. Then again, as discussed above, just creates this huge ripple effect if Boromir had not tried to take the ring from Frodo.
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Fenris Penguin
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