The last article is by far the weakest; it might have been a mistake to add it, but I thought it was interesting all the same.

There's a lot of empirical evidence that we all in general habitually underestimate our chances of being wrong about a lot of things, though I'm trying to change my habits on this after being presented with the evidence. But this is exactly why we should discourage people from having "fully general counterarguments" with which to defend what they believe: it's because of this tendency that we should all be doing our best to make our beliefs as vulnerable as possible to being overthrown by better evidence or better arguments.