Is it really unobjectionable to make a strong attack on a position and refuse to explain why?
It can be justified in certain circumstances. Sometimes I see a terribly wrong argument, but providing a satisfactory counter-argument would require much more time and space than I have available. In such situations, I will sometimes write a reply that the argument is wrong, but proving this would require more effort that I can realistically afford, so that the author should take it on authority and good faith that he needs to reconsider his position (and perhaps do some more learning before he’s competent to tackle the problem constructively).
(This is not meant to imply anything more specific about this concrete dispute—I am merely giving a general answer to the question.)
WrongBot:
It can be justified in certain circumstances. Sometimes I see a terribly wrong argument, but providing a satisfactory counter-argument would require much more time and space than I have available. In such situations, I will sometimes write a reply that the argument is wrong, but proving this would require more effort that I can realistically afford, so that the author should take it on authority and good faith that he needs to reconsider his position (and perhaps do some more learning before he’s competent to tackle the problem constructively).
(This is not meant to imply anything more specific about this concrete dispute—I am merely giving a general answer to the question.)