To answer your actual question though, I do feel sad when a celebrity whose work has impacted on me in some way has died for a number of reasons. You feel nostalgic when you remember why you became a fan of theirs in the first place, then you realise that you’ll never see any new work from them and see them develop their career further.
Sometimes the circumstances of their death are so frustratingly preventable, as you mentioned, but I am thinking more along the lines of Amy Winehouse there. I was never a fan of her music, but she became famous when I was in my teens and was very popular at the time so she still felt very familiar, and her death affected me quite a bit at the time because she had seemed to be getting better. I still feel sad when I think of her because I am now older than she was when she died, and she still had her whole life to live.
I feel sad when I hear that anyone has died, really, whether I knew them/of them or not because they were either loved by someone who will be missing them or, perhaps worse, would be remembered by nobody at all. I set up a syringe driver on a man in his nineties on Friday and despite it being the first and last time I would ever meet him, I felt so sad when I left him because I knew that he would be leaving alone since his partner died 20 years ago and he had no friends or family left. He was unresponsive when I arrived to see him but I made sure I said ‘goodbye, name’ when I left, just in case it was the last time he ever heard it. I checked his notes the next day and he had died in the night in between the carers in his care home going to check on him so he had been totally alone.
Death is a funny thing because it makes you think of your own life and that it could end at any time, even those who ‘have it all’ could die at any time. Sorry for the essay, I deal with death a lot and even though it’s in a professional capacity, it can be difficult to leave it at the door sometimes.