I don't get sad about it...but I think that it must seem "cool" to certain people to jump on the mainstream bandwagon and feel "devastated" when a celebrity, who they neither knew personally nor gave a damn about, dies.
It's always a horrible thing when someone dies, but it's a fact of life. I feel sorry for the family of that particular deceased, but I wouldn't go so far as to say I personally was upset.
It's like when Michael Jackson died and everyone was so distressed. Why? You like his music, sure, but he's also a suspected paedophile. Regardless of whether he was or wasn't, if someone suspected of paedophilia lived in the neighbourhood of any of the people who were "saddened" by it, they'd give them hell! Why is it that a public figure is more of a loss to society than anyone else? It's total bullcrap.
I don't mean to say that people shouldn't feel kinda bummed for a bit, but when normal citizens attend the funerals or "mourn" and "grieve" for someone they didn't know...that seems to verge on the excessive. It sucked when Brittany Murphy died (of the recent celebrity deaths, hers is the one I was most bummed about), but the people who truly have the right to grieve for her are her family and friends, not just people who saw her movies.
Sorry for that little rant, but I agree with BlindMessiah that it's annoying. It's just a bit over the top, these days.