Oh, I got it, this is one of these things where it doesn't matter what you pick, as long as your line of reasoning is correct.
Here goes...
1a) They ate the pineapple because the dipshit had not only set them up to waste their time, it also embarrassed half of them when they expected him to display any semblance of intelligence.
1b) For a long time already, they had the inkling that their friend the Pineapple was feeling a bit depressed. So after they sat around for a while they got it - he wanted to annoy them enough so that they'd do what he couldn't (him being immobile and all). So out of respect for all the entertainment he provided they helped him on his way to the afterlife, where he happily reincarnated as a banana.
1c) They came out there all the way without a packed lunch, and - it being a magical forest and all - none of them was a carnivore. The Pineapple just had the bad luck of being the only piece of fruit around.
1d) He wasn't forcing them to eat him, ergo they wanted to eat him. It was delicious.
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2a) This little hare did quite alright. He got into a race with an immobile object to win a prize. Just too bad the bugger cheated on him.
2b) To the shallow among us it appeared as if the Moose simply did not understand the metaphor, but further thinking reveals that this animal merely was displaying advanced critical thinking, which lead to him pointing out that the Pineapple hardly could have a grand master plan with it all, because, well, it was a piece of immobile arm-less prickly fruit.
He also did not mind the insults of lesser minds who could not comprehend his superior line of reasoning - a sure sign of wisdom.
2c) Being the only one who did look further than his own beak, he at least tried to figure out what that insidious Pineapple was planning.
2d) Definitely the Owl. He was the only one not taking acid.