Comment by rmunn
7 hours ago
The only reasons I can think of why your comment would have gotten downvoted is for ideological reasons, e.g. people dislike the president so they downvoted you for saying something even slightly positive about him.
Since HN is not supposed to be used for ideological battle, that seems unfair. So have a counterbalancing upvote.
Another reason I can think of is simple disagreement about facts (or, relatedly, disliking the lack of sources/evidence in the comment).
Like it or not, downvoting for mere disagreement is allowed here[0]. I personally think that any such downvotes should at least be accompanied by a reply, but I haven't been able to find official guidance about that.
[0]: https://news.ycombinator.com/item?id=16131314