Rarely would that apply to someone who's a national figure but it does in this case. Diana was in the prime of her life, Churchill had done his good. Diana was just getting started. David says we all feel more mortal with the death of somebody who is very famous and powerful. And not just that, because JFK was famous and powerful, but someone who was associated in people's minds with giving love and associated with giving love because they didn't get the love they needed.
People can related to that.
They can relate to the idea of not being loved. Everyone can relate to that.