The NFL"s alliance with all the betting company's is complicit in much of this. Too much gambling money relies on who wins the game, and the refs are either in on it or grossly incompetent. Either way I don't trust the results.
They are absolutely in on it - they have to get supplemental in come from somewhere. And if you think NBA ref Tim Donahue went to prison all those years ago bc he solely was the only one fixing games, I've got a bridge to sell you.