"So while it is true that I find really dark stuff funny sometimes, it's also true that as a writer of books I want to have the whole range of human emotions"

Rick Moody is suggesting that although he discovers dark humour amusing, he likewise wishes to explore the full variety of human feelings in his writing. He is implying that he wants to be able to discuss a range of topics, including the darker aspects of life, but also the lighter, more favorable elements. He is suggesting that he wishes to have the ability to discuss the full variety of human emotions, from happiness to sadness, from love to dislike, and from wish to despair. He is suggesting that he wishes to have the ability to check out the full series of human feelings in his writing, which he wants to have the ability to do so in a manner that is both entertaining and thought-provoking. He is recommending that he wishes to have the ability to blog about the full range of human feelings, which he wants to have the ability to do so in a manner that is both entertaining and thought-provoking.