I don't understand what point you're trying to make. Are you suggesting that if I can't feel empathy for everybody at once, or in every one of their circumstances, that I should not feel anything at all for anyone? That's not how anything works. Life (or, as I believe, God) brings us into contact with all kinds of people experiencing different levels of joy and pain. It's natural to empathize with the people you're around, whatever they're feeling. Don't over-complicate it.