Knowing failably and Moorean assertions

Knowledge-fallibilism is a species of a genus that I call knowledge-failabilism. Each is a theory of knowledge's nature. One apparent challenge to knowledge-failabilism's truth is the prima facie absurdity of Moorean assertions like ‘It's raining but I do not believe that it is.’ Does each such assertion convey an implicit and unfortunate contrast, even a contradiction? I argue that this Untenable Contrast analysis fails: no such contrast is present within the speaker's perspective at the pertinent time.