The first part of the quote you're using as proof is this: Fredric Wertham's general assertion in his book Seduction of the Innocent was that readers would imitate crimes committed in comic books, and that these works would corrupt the morals of the youth.
I'm not contesting the fact that Wertham saw Batman and Robin as homosexual fantasies and thought that such a model would turn children into homosexuals; anyone knows that who knows anything about Wertham. But at the time, his biggest target were crime comics. They were the most explicit target of the Hendrickson trials/commission (which were was led to the Comics Code being implemented), they were what got forbidden in several States, they were what parents were worried about.