Yes, yes, I know. Silverstein's work was pretty unique, and clearly more personal artistic expression than the agenda pushing that became ubiquitous during his generation. Frankly I view all the controversy and attempts at literally criticism around "The Giving Tree" and his other works to be a bunch of fart sniffing. Sometimes a cigar is just a cigar. There's not a whole lot of space for Jewish or communist propaganda in a body of work that seems like a sometimes macabre combination of fairy tales, Belloc's children's tales, and Dr. Seuss.

Edit: Except when you make it like OP's post.