Lots of forums don't have any kind of post rating system like this, so people may not know of any kind of etiquette at all when it comes to using them. It's a pretty reasonable assumption that they're meant to show approval and disapproval for posts, and that's what they did. Why have something as a feature tacked onto every single post if you're not supposed to use it frequently and with wild abandon? In the end, the points are useless and don't mean anything, so they did no lasting harm. I'd say it should just be counted as a learning experience for newbies and nothing to get upset about.