To say that the truth is always in the middle seems to be contradictory, doesnt it? — rickyk95
This is a tricky issue because it depends whether you are reasoning about the particular, or about the general.
When you are making claims about the particular, you can expect it to be the case that either something is true, or it is not. The thing in question is either present, or absent. Possible or impossible. It is a black and white bivalent choice with no grey.
But when you are making claims about the metaphysically general, you wind up with a dialectical argument or, formally, a dichotomy. You get two opposed extremes - both of which are "true" in being the limits of the conceivable. A dichotomy is that which is mutually exclusive and jointly exhaustive. So it is a system of thought for reducing vague possibility to two complementary alternatives - with the result that all actual possibilities will be found in the gray area in-between the book-ending extremes.
So we have all the classic categorical dichotomies that drive metaphysical level thinking. Is X discrete or continuous, substance or form, accident or necessity, plastic or static, determined or random, atom or void, etc.
We find that if anything is definitely the case, then it must fall within two bounding and apparently contradictory extremes of being. It might of course approach either bound with arbitrary closeness. Yet it still needs the "other" to secure its identity. You can only know you are close to one of the bounds because you know you are far from the other bound. So that leaves actual being always somewhere in "the middle" - the middle being the spectrum of all the states intermediate between to anchoring boundaries.
And this is why arguments play out the way they do. At first people are uncertain about the right answer, but they have some intuitions. They push the argument strongly in some direction, and that naturally exposes the dichotomous "other" that they are hoping to move away from and indeed leave completely behind. But then other folk can seize on the alternative and start to see its essential rightness.
The space of the possible get sharply dichotomised by a dialectical debate - and eventually it becomes obvious the sensible answer is "somewhere in the middle", the middle now being itself sharply defined in some measurable fashion as a result of the argument. An argument for black vs white results in 50 (or an unlimited number) of shades of grey.
You can actually make a still stronger argument than this.
Saying the truth is in the middle feels a little limp and compromisy. As if we are just happy with a gray muddle. But take an argument like whether intelligence is the product of nature or nurture. Or whether individuals should be free or constrained.
In the end, it feels dumb to say IQ is something like 60% genes and 40% upbringing, or whatever. You want to assign 100% value to them both. And this is because the sum of the two is more than the parts. It is like yes, both are completely true. Both of them contribute fully - and can do so because they are coming from complementary directions and are not treading on each other's toes. Their mixing "in the middle" is not subtractive - a dimming of each other's light. Instead it is multiplicative. By being sharply divided, they make any mixing a much more definite kind of mix.
It is like cooking. The best food combines strong and antagonistic flavours - salty and sweet, crunchy and smooth. You don't want to cook with bland muddled ingredients. It is contrast which produces rich complexity.
So the middle itself now needs to be understood as not just some bland state of greyness but itself a potential dichotomy. It's own "truth" could indeed be bland grey - a simplest possible outcome. Or it could be a zingy, zesty, complex mix of extreme contrasts.
But now we are clearly into territory that ordinary models of logic don't venture. As I say, most people's idea of logic goes no further that reasoning about particulars - the bivalent approach which wants to reduce a claim about a thing to the counterfactually definite options of true or false, yes or no. It is quite exotic even to suggest some kind of trivalent logic which uses the options of yes, no and maybe. Or 1, 0 and -1.
Then metaphysics is built on dialectical or dichotomistic reasoning. Yet for some reason, even this is not a widely understood fact.
Beyond that, I guess it is only over the past 40 years that people have really started to develop a mathematical-level appreciation of complexity - the rich mixture that characterises highly dichotomised middles. And here you would have to turn to hierarchy theory, and fractal or scalefree models of reality, if you want to see a proper "logic of middles".
Hierarchy theory is all about the middles that emerge between complementary bounds. It is a formal way of making the argument I outlined. It is the meta way of escaping the apparent circularity you identified in the OP.