We all do this. It is only more prominent in thinkers, however, it is almost inconstestable that a similar mechanism is to be found in the psyche of the Feeler.
What is the essence of Feeling? The working definition that I have in Principles of Typology (coming this fall) is a faculty of conscious scrutiny which deems entities as either desirable or undesirable. Basically all Feeling does is gives us a good emotive signal or a bad one, or in between.
In order to point out what we are dealing with, you need to use Thinking. In other words, Feeling in itself could not say a rose is good, or it makes me feel good, to point out that you are dealing with a rose, Thinking is necessary.
The mistake Thinkers often make with respect to understanding entities of interpersonal matters is neglecting to analyze them because they tend to be in a habit of supressing emotion which prevents them from taking interest in such things. Or starting with unsound premises because they have not observed the interpersonal entities thoroughly enough.
The mistake Feelers often make is reasoning improperly, or violating the laws of logic.
However, we should point out that the lower the function is, the less proficient we tend to be with the use of the function. For this reason, Fs with poorly developed Thinking tend to have unsound and fickle values because the reasoning behind those values is unsound and quickly changing. To paraphrase what you have stated, values are only as sound as the reasoning behind them.
3)It is an interesting hypothesis that my reasoning is unsound. However, if you are to justify this, you must cite my argument and show where I have made one of the following errors. Started with false premises. Propositions that contain what we clearly know to go against the facts. Commited a formal logical fallacy. For example, if A then B--modus ponens. If Georgie is a President, he lives in the white houtse. He lives in the white house, therefore he is a president. Or an informal logical fallacy. Such an error in reasoning may contain a sound process of thought yet the variables immanent within it could be illegitimate. It is of the same class as the first example concerning unsound premises. An example of this is the following. Appeal to authority. If Albert Einstein said X is the answer to the problem, then X is the answer to the problem. Albert Einstein said X is the answer to the problem, therefore X is the answer. The problem with this kind of reasoning is that we claim that we do not provide reasons for establishing the starting premises that we have established. With respect to personal will, it is not relevant what the person's motives were. I should not have used the term personal will in the first place. Prejudice is any kind of an unwarranted notion with respect to the subject discussed that one has established before the discussion. Why someone has the unwarranted notion is irrelevant (their personal will may be one of those reasons, yet not the only reason, the unwarranted notion could simply be a result of an error in reasoning or investigation of factual information altogether irrelevant to one's personal values)Though again, with respect to pointing out the prejudice, we must look strictly at the argument and see if we find any unwarranted notions. So, to prove that BlueWing is prejudiced you must show that first of all his reasoning is unsound, the errors he has commited were commited before he has posted his reasoning process. This is most easily done when somebody establishes the first proposition as an unwarranted premise. Psychologizing the person is altogether irrelevant. Again to underscore, whether BlueWing may have an affinity with the INTP type, or whether he may value this or that just doesn't matter. All that matters is the argument he put forth and whether or not errors in reasoning could be observed in the provided text.
4)Yes, thinkers do have concern for the interpersonal factors. Yes, thinkers are motivated by interpersonal motives to some extent. To be a Thinker means to be more influenced by Thinking than by Feeling, not to be influenced by Thinking in entirety, and not at all by feeling. Yes, there are thinkers who are very attuned with emotions and will mount attacks upon yours. However, such folks are rare. Most Thinkers tend to be motivated primarily by impersonal motives.
5)Thinking and Feeling are intimately intertwined. In order for one to make a good value judgment, one needs thinking for reasons provided in point one. In order for one to find the motivation to Think, feeling is necessary. Feeling is the motivation for all things, as this is the only cognitive faculty attuned with our human side. The rest are mere dispassionate processes of cognition. However, despite that Thinking is inextricable from feeling, it is possible to emphasize Thinking more than feeling for the sake of highest clarity of thought of possible. It is also possible to emphasize Thinking enough to be clear-minded without repressing Feeling to the point of robbing oneself of motivation to keep on thinking and the motivation to pay attention to the personal aspect of the situation.