Passage: Douglas's campaign against The Well of Loneliness began on 18 August, with poster and billboard advertising and a teaser in the Daily Express promising to expose "A Book That Should Be Suppressed". In his editorial the next day, Douglas wrote that "sexual inversion and perversion" had already become too visible and that the publication of The Well brought home the need for society to "cleans[e] itself from the leprosy of these lepers". For Douglas the sexological view of homosexuality was pseudoscience, incompatible with the Christian doctrine of free will; instead, he argued, homosexuals were damned by their own choice – which meant that others could be corrupted by "their propaganda". Above all, children must be protected: "I would rather give a healthy boy or a healthy girl a phial of prussic acid than this novel. Poison kills the body, but moral poison kills the soul." He called on the publishers to withdraw the book and the Home Secretary to take action if they did not.In what Hall described as an act of "imbecility coupled with momentary panic", Jonathan Cape sent a copy of The Well to the Home Secretary for his opinion, offering to withdraw the book if it would be in the public interest to do so. The Home Secretary was William Joynson-Hicks, a Conservative known for his crackdowns on alcohol, nightclubs and gambling, as well as for his opposition to a revised version of The Book of Common Prayer. He took only two days to reply that The Well was "gravely detrimental to the public interest"; if Cape did not withdraw it voluntarily, criminal proceedings would be brought.Cape announced that he had stopped publication, but he secretly leased the rights to Pegasus Press, an English-language publisher in France. His partner Wren Howard took papier-mâché moulds of the type to Paris, and by 28 September, Pegasus Press was shipping its edition to the London bookseller Leopold Hill, who acted as distributor. With publicity increasing demand, sales were brisk, but the reappearance of The Well on bookshop shelves...

Question: What was Douglas's exposition against The Well of Loneliness that he released in the Daily Express?
need for society to "cleans[e] itself from the leprosy of these lepers"