Software patents do not provide the benefits other patents do. Name a piece of software that would likely not have been written if it wasn't able to be patent protected. Now compare that with other industries like pharmaceuticals, textiles, chemical processes, etc. Software is different because it's more straight forward engineering than explorative science. If an implementation is obvious to anyone with the prerequisite knowledge, it's not patentable and there's really not much, if anything, in the software realm that meets that criteria.