Earlier quoted context omitted.
I think the problem when it comes down to it is there's generally more than one kind of comment as well as more than one kind of reason someone downvotes. You've got your objective factual comment Your subjective factual comment And your opinion based comment. I'm probably missing some. These can all be combined sometimes into one comment. Then you've got your reasons for downvoting. Disagreeing Factually incorrect W…
But that would still happen in an upvote-only system. The 'good' comments would float to the top and the 'bad' ones would stay low in the threads and sub-threads. To be honest, I feel the most damaging in the HN voting system is the greying out of comments. It often leads to bandwagoning where if a comment even goed to 0, some people just blindly ram the downvote button because someone already (visually) decided for…
But, I do agree, systems with upvotes only works sometimes, it seems to depend though. On one forum I post on, they only have upvote equivalents, but it tends to lead to fairly quality conversation a bit like hn, though memes and jokes tend to get upvoted far more than here....or maybe without downvotes you actually get to see the upvotes on jokes, I dunno, I've made a few of those one liner joke comments hn frowns upon and watched it go up and down over and over until it settles between -1 and 2 depending I guess on whether more people found it funny or annoying.
But...with upvote only systems, you also get horrendous trash like Facebook.
Then again, with upvote/downvote systems you get decent places like hn and horrendous trash like reddit and SO(an over exaggeration to allow me to keep this paragraph similar in structure and phrasing to the last) so who knows what's best really?
I think in the end it always comes down to the community and the mods.
It doesn't matter what kind of point system you have, what matters is the people who are most involved in the community, the rules of the community and how the mods act.