I think it's because book 2 is where Haruhi achieves her lowest depth of sociopathy, regarding people as mere pawns in her games. For example, in one scene Kyon tells her to stop harassing Mikuru so much, and Haruhi declares in so many words that Mikuru is her toy to play with, which gets Kyon the angriest at Haruhi that we've ever seen him.
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