MssAdventure, I am sure many feel like you, but I have also experienced being sideswiped by the death of people I do not know well, but whose demise for some reason, I cannot explain, affects me deeply.
My sister headed an organisation that had much to do with the great and good, and after her death in a road accident, many wrote to us and came to the memorial service. I was taken aback by the number of people who told me how deeply they were affected by her death, that they too were disconcerted that her death had affected them so deeply.
That was over 30 years ago, yet in the last 10 years, someone I met through work I did, realised from some thing I said who my sister had been and spoke to me of her for about 10 minutes, speaking as if he had seen her the previous day. Their relationship was entirely professional, but some how she had cast her spell.
This happens to people and to think because you, whoever 'you' may be , do not feel like that, it in someway makes you morally superior to those who do, shows a real indifference to other people in all their variety and ambiguities.