It seems there are people on HN who downvote because they disagree with your opinion. Is there a reason comments aren't required when downvoting? I think making comments on down-votes mandatory would go a long way in making HN more transparent remove fear of posting something, which some may disagree with.
The world would be a very dull place if we all had the same opinion.
If you are getting downvoted occasionally then there is not much to bother its part of life. There will always be ones who disagree. But adding comments to downvote will be piling up mess upon mess.
in case you got downvoted and you didnt mean to be a trouble maker, lets ignore and live happily together. In the end is HN a place where one seeks appraisals alone?