Click your username at the upper right:
Turn on "showdead": showdead: yes. (defaults to "no")
There are a number of dead posts in this thread. I'd post some here (some of which don't appear to violate any HN guidelines, I'll note), but probably those same moderators would kill this one, too.
HN is awesome because of the rules and moderation (including bans); any unmoderated forum devolves into a cesspit; and it only takes a surprisingly few bad apples to ruin a community.
However, look at the dead comments here and, for each, tell us why it would turn HN into a "cesspit."
In many cases it's not the particular comment, it's the particular poster who is shadow-banned, and all of their comments are dead on arrival (to everyone but themselves, the definition of shadow banned). But people with showdead=true and enough karma can vouch for them to resurrect them if they're worthwhile.