I have chatted much w my entp friend about this topic. Have you heard the commercial on the radio recently where the women hides in the closet drinking a diet dr pepper and her husband finds her? Then she acts all crazy and guilty and he just says "I dont understand" and shuts the door.
she says feelers are like that. totally bizarre and lacking in T style logic mostly.
I think you are seeing biology at play. Evolution found empathy to be a handy tool for the survival of many more advanced animal species. I scratch your back and you scratch mine. The social bonding that glues groups of animals together relies of mixes of all the fun love hormones-dopamine/vasopressin/oxytocin. One animal is sick or needs a bit of help, the others will help-TO A CERTAIN EXTENT. If the animal fails to thrive after some time, they will abondon it and the animal will let itself be abondoned.
empathy yields social assistance which either results in recovery, in which case the animal may later help the first animal, or failure to recover which results in depression , abondanment and death.
Most important- For a feeler empathy is a feeling of unhappiness or even true discomfort at seeing others in pain. Nobody likes to be in discomfort so they act to remedy that internal discomfort by helping the other who was suffering.
For an SF, the above scenario makes sense. They will help those in thier immediate social group and the Feely give or take of help enhances the social bonding of the group. The SF lacks the big world picture, thus can ignore the suffering outside the group or easily abandon those who do not fit well within the group.
For an NF (at least me), something is off kilter. I cannot ignore the big picture. I recognize the suffering of the larger group and thus at times have felt considerable discomfort/aka empathy, that I cannot do more to relieve the suffering of the whole. It is actually sorrow and pain. I have at times carried around a lot of guilt for no real reason, just that I feel like I did not "help" enough. I have had to learn to mentally forgive myself for those feelings even though I never did anything wrong in the first place. Likely volenteer work is the best mental therapy you can have any NF do. It makes me mildly euphoric. (coo-coo) Also I have noticed that a lot of NFPs end up as subs in S&M relationships-potentially as a way to seek that "forgiveness" in a controlled safe fashion.