Earlier quoted context omitted.
You have to have a minimum amount of karma here to get a down vote button. I think it's 500.
Correct. And to add: it only applies to comments; non-moderators cannot downvote stories
For myself, I only downvote/flag stuff that I consider harmful to the community.
That does not include stories or comments with which I disagree. In fact, I frequently upvote comments posted, that attack my own positions, if they do so in a reasonable manner. Groupthink sucks, and I frequently change my mind, based on orthogonal feedback.