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One of the author of this post is actually a psychotherapeut working precisely in this domain. Who said there is a clear conflict of interest here?

Who decides what is harmful, dangerous, or toxic? Do you guys have some official and public guide-lines about that?

It seems to me that you fail to understand the natural direction of interpretation. Given an "object" O, an "interpretation" of O in terms of I is a map M: I -> O that preserves some structure from I into O. Not the other way around.

Your physical scale (or your physical thermometer) is before all a physical object S. Calling such a physical object S a scale is asserting the existence of an "interpretation map" M: I -> S that preserves the structure of I into S, in a relevant and satisfying way.  What is the domain I here? For an engineer, it's going to be the theory of Newtonian mechanics, the primitives of which being the concepts of mass, space, time, and force. On top of that, a very explicit notion of weight/gravitational interaction between two objects has to be given. 

That is, the domain I of the interpretation map actually contains more than just the primitive concepts, it also gives an explicit form of F in the F = ma part of Newtonian mechanics. You can for example go with F = -mg if that satisfies you, or go with the less incorrect -GmM/r^2 form. Still, both forms require as data the earth's mass and a knowledge of G (either directly, either indirectly by a process of calibration).

So suppose that you have such an interpretation map M: I -> S into your object. S is now called a scale if it preserves the whole structure from I in a way you judge satisfactory. That is, if it shows the expected numbers predicted on the domain of M, and if it preserves the relative order of mass/weight difference (given two objects O1 and O2 to be measured with S, if the domain I says that the mass of O1 is superior to the mass of O2, then S agrees). Note that if you were rigorous, it is not S that is interpreted to be a scale, but M(I).  It would be a mistake to think that S is uniquely and completely characterized by M. In fact, even M(I) is not completely or uniquely characterized by M (as in, it is possible to find different maps from the same I into M(I), to find different I, etc.).

This is where lies the problem with language. The "uniqueness part" is very very wrong. There exists a lot of different and incompatible domains that are yet mapped satisfyingly into your sentence. A lot of wordplay are actually based on that. Language is also non-associative, but the parenthesizing is never written explicitly. It is also non-commutative (both within a sentence, or between sentences themselves), but that's less of a problem.

What is important to understand in any case, is that this interpretation process is not a canonical or choice-free one. A decision is made at some point, by someone, so it is inherently subjective. Physics being extremely constraining and authoritative, these choices and fundamental ambiguities are generally barely visible in the daily world/engineering world. For language, however, you cannot avoid them. It gets even worse when the very same word of the dictionnary can refer to multiple incompatible concepts already.

When it comes to your post, you're basically asking people to try to find the good domains/theories that explain what happens in a net. First, a net is a black box, so good luck with that. Secondly, people are trying to do so for decades and are failing hard.  Finding the good "I" is just an extremely difficult task.  Even if you had some good "I", asserting that what you see in a black box is indeed well interpreted by such a specific domain (and not another one) won't be convincing (most likely). Any metric people are using to quantify what happens in a net is already playing the role of a scale. It's just not an interesting scale, generally.