You can probably partially blame this one on me. I had someone downvote a post and could not figure out why, so asked. The discussion (if it can be called that) was not very productive, and I think the reason was I posted a followup several days later. The point of this rule is that you should not be worried about one or two down votes because there is a good chance there is nothing significant about them. Keep in mind that noderep is about the overall quality of the node, so getting too hung up on one vote like I did is missing the point. The current implementation is a great reminder of that and I'm fine with it.