Very few people in the world count as irreplacable.
That is beside the point -- not every loss needs to be a net loss in order for it to matter on some level. At the very least, this sort of thing serves as a reminder of one's own mortality.
I mean really, if what you are saying is true, shouldn't we all be crying constantly
No, that degree of empathy would be super-human, not human -- not to mention counter-productive. But I do believe that there is more to be gained from a two-second pause for reflection than an "I really don't care" kind of reaction.
Why should anyone that had no clue of even his name before this story pretend to care that he's gone?
Well, there is this school of thought:
"No Man is an Island, entire of itself; every man is a piece of the Continent, a part of the main; if a Clod be washed away by the Sea, Europe is the less, as well as if a Promontory were, as well as if a Manor of thy friends, or of thine own were; Any Man's death diminishes me, because I am involved in Mankind; And therefore never send to know for whom the bell tolls; It tolls for thee."
--John Donne
Ubuntu can't network out-of-the-box, and needs a Verizon CD? Whoa!
Verizon ships their DSL modems/routers configured to refuse to make any outside connections. The Verizon install cd then flips a setting on the router to enable internet connectivity. To do this manually without the installation cd, one must visit the completely undocumented page http://192.168.1.1/verizon/redirect.asp and click "disable." This is not exactly the sort of thing one could expect a non-technical person to discover...
We are not a clone.