There are more than two sides, you see. You can fight against the Elves without fighting alongside Sauron, and against Sauron without fighting alongside Elves. Also, fighting alongside somebody doesn't mean that you like them, like when the US, UK, etc. fought alongside the USSR, and then turned around and had a Cold War against them.
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What's a burrahobbit got to do with my pocket, anyways?
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