If only sports enthusiasts could be more dispassionate and rational and less of a 'fan'atic, then we could ditch the simple arguments about causality, the superstition, and the biases.
Evidence, sources, and an open mind are great things to bring to understanding a problem. More often than not the average fan leaves these at home and things devolve into a "because I said so and you're a loser if you don't agree" that DR mentioned (at least that's my understanding of what he said).
At the risk of coming off as an elitist, I think sports conversations tend to be pretty lowbrow. I don't mean to say that sports enthusiasts are by nature dumb. What I am saying is that many people here and elsewhere take disagreement personally and don't know how or want to have a civil conversation about what causes what. We all lose out when that happens.