The double-standard fallacy states that one case should not be improved because another case is equivalent or worse. For example, one may state that "we should not remove unreferenced information from this article because other articles have unreferenced information". This assumes that the worst case should be applied everywhere, which is probably not the intended results.
Rather, every case should be improved on its own merits. Double-standards can be resolved by applying the higher standards to the lower, rather than the reverse.
See also Wikipedia:Other stuff exists