The Brother-in-Law's Argument for a Negligible Effect

"We can't test for absolutely everything, so at least testing for the most reasonable and likely confounding factors is a good idea," he says. "He then sarcastically said that by my logic, we should also take into account the angle of the sunt position of the moon and a whole bunch of other nonsense factors." The brother-in-law was saying in this car tug of war, they stayed, there were all these other factors they didn't control for - but how do you know they would have been negligible? He's giving just a ridiculous example and say that was just ridiculous,. But it's what he's doing. It's like, well, who gets to decide what