Emotion...
It does make sense in movie terms, as there is the added emotional power of all the remaining Fellowship travelling to the last battle together for Frodo's sake. Leaving Merry behind removes this emotional fulfilment and completeness.
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'Dangerous!' cried Gandalf. 'And so am I, very dangerous: more dangerous than anything you will ever meet, unless you are brought alive before the seat of the Dark Lord.'
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