It's quite simple, really. "but" is just like "and" when used as a conjunction. In natural language, "and" has the conotation that the two things are normally in agreement, or neutral toward each-other, whereas "but" has the conotation that the two things are normally in oppisition. Note that people very rarely make "but" lists, but quite often make "and" or "or" lists; "but" is a preposition only, but "and" and "or" are list specifiers.
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