That’s because all you’ve done is deprive him of evidence for his belief, not make him disbelieve it – wiped out one of his squadrons, so to speak, rather than making him switch sides in the war.

The wording here is very unfortunate. You seem to be alluding to the fact that the hypothetical Scotsman is using arguments as soldiers, and in the same sentence go on to reinforce the unproductive notion that argument is a battle between factions.