This is NOT nearly the first time. There is a pattern, and the only reasonable explanation is that one or more HN MODs just do NOT like a lot of my posts and jump to downvote ASAP with anger.
A guess that fits the facts of what they don't like is anything critical of any other media outlet, anything about CS, or anything about venture capital. But it is necessary to guess since the downvoters essentially never respond to the substance of my posts. The situation has clearly become personal for them and, then, me.
You can be critical of things without being irrational about it. As an example, note my edit your post:
"This isn't the first time. One or more people at HN do not like my posts and downvote them. I can only guess at why I'm downvoted, since often times the downvoters do not respond my posts."
It's concise, does not make any assumptions, avoids CAPS LOCK except where abbreviating, doesn't call anyone a chickenshit, and otherwise gets right to the point. I'm pretty sure that if your replies were more like that than "MYSTERIOUS SITE MODERATORS ARE CHICKENSHITS WHO ARE OUT TO GET ME" you would end up with less downvotes.
I'm with you - it can feel frustrating when you post something, and then lose karma without any rhetorical exchange about why. Sometimes you can ask for an explanation and actually get a response, but sometimes you're just left hanging. Don't sweat it, and keep moving.
I always know when my posts will be downvoted, and I don't understand why anyone else would have trouble identifying the same. The community here has its norms of behavior. When you violate one of them, expect to get the karma smacked out of you.
A guess that fits the facts of what they don't like is anything critical of any other media outlet, anything about CS, or anything about venture capital. But it is necessary to guess since the downvoters essentially never respond to the substance of my posts. The situation has clearly become personal for them and, then, me.