Why do both Thorin and Gandalf agree that the Rivendell elves will try to stop the quest (and so they must lie about it e.g. academic interest only) and then when Elrond finds out, he's not that bothered.
That's classic farmer Joe.
[Some may not be familiar with this or recognise this particular label, but it's a story about a guy who's walking to his neighbour's house to borrow his plough, but on the way he wonders what if Joe's using it, or it's broken, or won't lend it to him. And so this goes around and round in his head until finally he reaches the door, knocks on it and when Joe answers he says "fuck you and fuck your plough".]
Why does Balin attempt to stop Thorin handing the map to Elrond, and then as soon as the runes are deciphered he blurts out the actual mission objective right in front of Elrond?
Yep, I got nothing.