If I add a comment I jnow will be downvoted I simply move on with my day, not bothering to see the responses generated. This is because, even though I work hard to only put forth constructive criticism and in a manner such that my logic / reasoning is plainly spelled out,,,

On HN, unpopular comments are, often, still voted down despite the facts and despite the presentation.

I usually reserve these instances for when I know more than a little on the topic, generally professionally speaking, and often first hand. But, if it is unpopular, it doesn't matter. It's predictable.