Either the games are steered for various reasons, the officiating is bad on purpose for various reasons, or the refs are completely incompetent. I find it hard to believe it's just human error or incompetence when the NFL has more than enough time and money to invest in at least decent officiating with the occasional mistake. I also don't buy the excuse that there are too many rules, because they frequently get the most basic penalties wrong and call them one sided.
Right now, the NFL is just an addiction I'm trying to kick. At least when I smoked and drank it would calm me down. This addiction has the opposite effect