@Zetherin,
Intersubjectivity is just another word for consensus. And I do find it persuasive. I find all sorts of things sufficiently persuasive. What I'm interested in is the location of the foundation of that which we call truth.
As I've said before, this is strictly a theoretical question. Animal faith is faith enough. I'm not trotting out my Pyrrho costume here.
Objective reality is an extremely useful mental model. In a practical its
obviously true. Solipsism is nothing but a parlor trick. So, if anyone is projecting that sort of game on yours truly, cease and desist -- it causes blindness.
We all have a mental model of the human mind, and then also a mental model of knowledge, truth, etc. The question is one of relationships. Quito bores me, and is off the point. But my point still applies to that. Still, such a trivial example of consensus is not at all what I was focusing on.
Forget the capital of cities. Consider instead our various idiosyncratic mental-models of knowledge, truth, righteousness, etc. How do we end up with these particular mental-models? Pretty obviously we absorb them from our parents and our culture. Then we continue perhaps to read many books. This is especially the domain of persuasion. Why does Joe like Rorty's view of truth and Tim like his Uncle Jim's?
It's presumable that no mental-model of objective reality is exactly like another. For every person Reality is different. But there is plenty of intersubjective overlap for us to forget this. It's also in our favor to see the world more socially. We accept the usual signifier-signified relationships just to be admitted to the game.
What I suggest is the impossibility of perfect knowledge. And this is hardly an extreme suggestion. I'm surprised how little understood I've been on this.
Surely I'm not the only one in this conversation that realizes that individuals have idiosyncratic mental models of objective reality. Surely I'm not the only one that sees that objective reality is just the overlapping of subjective realities.
Think of intersubjectivity as a Venn diagram. Where the circles overlap, there is your "objectivity." And, as far I can see, nowhere else.