I find this topic to be of great interest both clinically and on a personal level. This is my first post and couldn't stop myself from commenting.
Being an INTP, I generally find it easy to isolate patterns and to make sense of Jungian Function Theory. I tend to find that the monetized MBTI version of the system is too surface as it doesn't allow for a full understanding of the way Jung meant it to be used. Taking a deeper look into the nature of an INFP with this in mind, one can make a few theoretical observations that are a bit more clear, concise and accurate in respect to how their mind works.
For starters, the INFP tends to receive all this chatter about being capable of deep feeling and for being a genius of emotion, etc. This may be true. However, in English at least, the word 'feeling' is generally associated with positivity. To 'feel' is considered a positive act and is generally ascribed to mean squishy soft feely happiness. In a clinical setting, though, the word feeling is simply the act of feeling. It doesn't mean good, bad or indifferent feelings. It just means feeling. And since the Jung System is a clinical system, we need to define the word feeling in a clinical way. Therefore, the INFP is completely capable of harboring evil, violent or even murderous feelings, in addition to happy ones. It's all a matter of who they are and what sort of internal landscape they reside in.
My sense of INFPs is that they are built with an enormous potential to do a lot of good, a lot of bad or both. And no matter which direction they point it, they will be remorseless and carry almost zero guilt. Their moral system is entirely subjective, self built, and will be defended to the death. They avoid culpability at all costs. Trod on their ideals and you will be swiftly disposed. Show them an empirically undeniable fact that is counter their core ideals and they will almost always spiral into a thinking hissy fit and irrationally fuel themselves into an emotional gorge fest trying to find a way to disprove what they can't deny factually by feeling their way out of it. Or more often, they will shut you out, the idea you delivered and everything within a 10-block radius that contradicts how they wish to feel. Why? Because they want to curate a certain feeling-scape and you just messed it up with something external and outside of their control. They are die hard self preservationists. To the point I've watched them self destruct, steal, inflict damage and even put others lives in danger to meet a need to feel a certain way. Said another way, they are prone to emotional manipulation in order to achieve a desired emotional (feeling) outcome. And they will systematically avoid data or observations that contradict any such outcome even if it means causing harm or ignoring the safety of themselves or those around them. This being why they are conflict averse.
In summation, I find them to be exceptionally stubborn, difficult to communicate with in a balanced way, and generally, dare I say, selfish. They are also prone to manipulate, although they won't tell you this. Mostly because they don't view it that way. Much like a person trying who is trying to win a debate will edit out points that damage their position, INFPs do this with emotions, and will do what they need to in order to manage the desired emotional outcome both inside themselves and in you, if they value something you've got or you are assisting in helping them achieve the feelings they wish to feel. Basically there is an inborn ability to view people as emotional tools for their own benefit. If they are in line with the common good, great. They're normally innocuous. If they are maladjusted or have ulterior motives, look out.
Saying all of this I gather you can now see that the INFP has a lot of potential. And that potential can go one of two ways ... effectively and fast.
Scary stuff.
