If there's one thing that unites us all, it's the inevitability of death. That may sound morbid, and it's not something most of us care to think about, but our mortality is something every person on Earth has in common.
However, ideas and beliefs about what dying means are as diverse as humanity itself. So when someone manages to nail a universal truth about death, we pay attention. And when someone does so in a way that touches us deeply, we share it as a way to say, "Look at this gorgeous evidence of our shared human experience."