You just highlighted exactly what I tried to write about! Why have a thread full of condolences from strangers directed at strangers and shun any actual discussion?
Most people clicked the story to find out the cause of death. If this young man indeed killed himself, we could have a reasonable discussion about the stresses of life and specifically related to tech, but we can't.
Instead, I strongly believe that most (if not all) condolences posted here come from people fulfilling a social expectation rather than a specific feeling towards this person.
I would hope those who knew this person and know his surviving friends and family have a more direct line of communication than comments on news.yc.
Because this is how people deal with the existence of death, and they appreciate having a place to pay their respects independent of having an "actual discussion." Why do you think that ceremonial burial is a near-universal element of human culture? A breaking-news thread announcing a person's early death is a terrible place to have a discussion about "the stresses of life...related to tech." You should have that discussion inside your head, and then engage other people with it at a time when they did not just hear about someone's suicide.