If the number of people buying ice cream at the beach is statistically related to the number of people who drown at the beach, then nobody would claim ice cream causes drowning because it's obvious that it isn't so.
如果在沙灘裡購買雪糕的人數是與在沙灘裡遇溺的人數有關的，那沒有人會斷言雪糕會導致遇溺，這是因為這是明顯地無關。