Why is it interesting to study anything?
Science is a way of describing the physical world around us. Clearly you lack appreciation for such knowledge.
Perhaps join the apes? They don't seem too interested in science either.
Securitization tranching assumed financial disasters were statistically independent. In a panic they are not. They teach this in Probability Statistics 101. Goldman Sachs realized this and made a fortune off the the so-called junk-tranches.