By any measure the four members of the Beatles made more people happy than most of us manage to do. In return two of them were the victims of attacks by homicidal maniacs. In one case it was fatal. In the other it may have contributed to an untimely death.
Bob Marley was the victim of a drive-by shooting. Bjork was targeted by a "fan" who mailed a letter bomb to her home and then killed himself on camera. Those are just the cases I can call to mind right now. There are no doubt hundreds of similar incidents that were intercepted by security and never got as far as the media.
And now Joss Stone has to live with the thought that a pair of murderous misanthropes set off from the other end of the country with the intention of killing her and were only apprehended because they were more than ordinarily stupid. I'm not being facetious when I say that this really is the ultimate downside of pop fame.