We all know how futile it is to argue - futile in the sense of how exceedingly rare it is for one of the arguing parties to change their mind and concede the argument. You often see the problem in long comment threads and wonder why people bother. Comments are a vital aspect of blogging of course, but make a comment and move on is my policy.
As suggested by the immortal Monty Python sketch, argument is a social game, a contest, a battle for supremacy. To concede is to lose, but as nobody ever needs to concede, nobody loses. Verbal behaviour is so subtle, so flexible that the point at issue will never be brought to the table unless it suits both parties to do so. Of course it hardly ever does.
Often there is no point at issue at all and the contest is merely a battle of words, a skirmish between differing modes of verbal behaviour, differing verbal habits.
Or maybe you disagree?