Hacker News is a funny place and you'll find contrarian points of view tend to be "jumped on" unless you use difficult to refute language that pulls your disagreeing commenters or downvoters into a logical argument.
The other guy that commented on yours is a good example of language that's less "enticing" for trolls and still provides an interesting counterpoint to the original article.
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.
Me to, and I hope it's true of most users here.