Why NFs care about others peoples feelings so much?
From my own personal viewpoint I think it's just one of those attributes in the Feeling function that just makes NF's "in-tune" with the other persons feelings, as we take things through our intuition and feeling, we sense this more? I don't think it's a better or a worse thing than Thinking, it's just how it is for NF's. The difference (I guess) with SF's is that they are not "in-tune" with the invisible environment as much and so the feeling might be more "concrete" in a way.
Personally, I care simply cause I can't be without caring. If I feel what others are feeling, how could I ignore it? I couldn't.
Do you think that all people are equally soft at core?
I actually think all human beings are soft at core, but how deep the core is, that's a whole another thing. I don't believe in good or bad, but I do believe in selfeshness, manipulation and deception; all come down to motives. Therefore I think it's not valid to say I'd be easily mislead or just manipulated, though I might seem this way to new acquintances and outside world in general.
Also NFs say that they can feel other peoples feeling as their own.
I am interested in which way does this really efect you.
Torns me apart internally. I'm deeply affected by others suffering and just want to make it better.
Do you give empathy/simpathy to others(when they need it) in a way that you are aware of it or in a more spontaneous way?
This is probably part where J/P will play a role.
I rarely lose my "composure" in showing my real, deep feelings, but as they exist, I usually choose a "safer" route in exposing them, so when I e.g. feel extremely emphathetic (as in feel the other persons feelings) I might actually show it to him/her as sympathy , as oppose to the "genuine empathy" that I am feeling. I am controlled in my sympathizing manner.
I've noticed that when I'm listening to someone tell me something sad, my body language and face especially reflect the inner empathy I have within, but the unability to be "natural" in actually helping them out bothers me. I could never "cry with somebody", I can't sympathize on an emotional level, even if I wanted to show them it. Although I feel like I'm not a good listener, many have said that I am, and I know people easily confide to me, even if I didn't have anything to offer them (enough).
Also it looks to me that one of the greatest fears of NFs is that they will be in bad mood so that they will not notice that the person who they love is suffering and it needs their help and care.
Is this true?
I don't know about "greatest" fear but I always feel pretty bad about myself for throwing my problems into smbd elses lap.
I think that probably all of this works for SFs also and I wouldn't mind to get their opinion on this as well.
My sister is an ISFJ and I've noticed she's extremely emotional but... just different in handling this information. She's more practical I guess.