Fandom: ... shall be obvious
The reasons for his actions had usually been transparent to himself, at least those actions that by necessity had to remain hidden from others, and as such much less interesting than the challenges, artistic and otherwise, involved in their performance. He considered his needs simply as datums to orient his activity, and curiosity was not the least strong of those needs.
Therefore, when the more involved of his bibliophilic investigations turned out a coup of unsurpassed antiquarian interest, and when the contents of his discovery seemed to hint at previously unknown psychological and perhaps phenomenological depths...
Well, having found one of the exceedingly rare complete copies of the Necronomicon, Hannibal Lecter would have had to be a much different man not to experiment.