Eulogies on arbitrary people might help with motivation, and if you're doing that you might as well chose one with a minor advantage like not needing a long introduction to make the reader empathize, rather than choosing purely at random.
Are you suggesting that putting eulogies of famous people on LessWrong is a good idea? That sort of sounds like justifying something you've already decided.
Not quite. I'm saying that GIVEN you want to spend a post reminding people that death is bad, talking about a single death might be more motivating then many. And that GIVEN you want to talk about the death of an arbitrary individual, you might as well chose one likely know to the reader than one that is not.
The sad news broke tonight : Neil Armstrong, the first human to ever walk another world, died today. We lost him forever. He died before we could defeat death.
Once again the horror of death strikes. This time, in addition from wiping from us forever a hero of humanity, he wiped from us forever a memory that will never exist again. Never again will a human being be able to experience being the first to walk another world. That beautiful experience is lost forever too, along with all the memories, dreams, desires and wishes that made Neil Armstrong.
But thanks to him, humanity made a giant leap. We'll fill the stars and conquer death. The spark of intelligence and sentience will not extinguish. That's the best we can do to honour him.
Source : http://www.reuters.com/article/2012/08/25/us-usa-neilarmstrong-idUSBRE87O0B020120825