It's not that the regular refs don't make bad calls, but the replacement refs are making a multitude of them in the same game, plus they seem to be losing control at times, which means player can, and probably will, get hurt. Some of the refs are even confusing college rules with pro rules, which does alter the game. I can forgive an occasional blunder, hell I've officed in numerous sports myself and know how difficult the job can be, but there are more than what I'd consider allowable mistakes in just one half, let alone the entire game.