[snowwrestler]

I have had comments that go against the grain of a conversation go all the way to light gray, then about 24 hours later they are well into the positive.

My subjective experience is that there seem to be "shifts" on HN. Folks who are too busy during the day to surf HN may log in during the evening; these folks collectively might be more welcoming toward a skeptical or conservative comment.

And even if some of your comments go negative, there's not really any reason to delete them IMO. It's a learning experience...either you learn that you got it wrong, or you learn that most other people have it wrong. :-) Karma is just fake Internet points anyway.