I don't understand the perspective you're coming-from.
True empathy is where one totally-understands another's experience/perspective, & one "is one with" their condition/experiencing.
It isn't that it makes you feel good to do that, or even to be able to do that: it's just wired in, an innate-muscle of mind ( the mirror-neuron system, which seems to be broken in psychopaths ).
Why would being pierced by another's grieving make one feel good to be doing?
Honest empathy isn't self-serving.
It is overwhelming.
_ /\ _