Why would anyone want to make nonprofits as inefficient as Byworks Corporation, which has posted huge losses for years? The reasoning of the argument in the letter is most vulnerable to criticism on the grounds that the argument Letter to the editor: You have asserted that philanthropists want to make the nonprofit sector as efficient as private business in this country. Philanthropists want no such thing, of course. ["concludes that a phenomenon will have a certain property merely because the phenomenon's cause has that property", 'rejects a claim by attacking the proponent of the claim rather than addressing the claim itself', 'draws a conclusion about what ought to be the case from premises that are entirely about what is the case', 'takes the condition of one member of a category to be representative of the category in general']