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Holden loves anything connected to a sense of innocence, mainly children, and he dislikes anything that tries to rob people of their sense of innocence, mainly "phonies." Really, that's about it. Holden is skeptical about pretty much everything else.
Also consider the only time that Holden really smiles is when Holden goes to meet Phoebe and he takes her to the park to ride the carousel. While she rides, he watches her and is glad that she is taking a risk so that she can learn from her childhood experiences.