I wouldn't say this is true for all INFPs. I'm not sure you understood the point of the question. They tend to understand vulnerability and the suffering of the human experience to the point where, why not treat others with kindness and respect, because that is the way they would like to be treated themselves. They can go to dark places in themselves that no one else can. And they will try their best to understand the point of view of others without judgement and understand the emotional complexity of the situation. Introverted Feeling is a very positive function, and they will tend to focus on the best in people and things, including memories and will keep their focus on that.