Well, because the US Code has to handle literally every single actual occurrence of every permutation of actors and circumstances that has ever occurred and has been «important enough» to make a codified rule about. (law.stackexchange.com)
Therefore, the propensity for (and actual occurrence of) dog escape due to uncontrollable aggression and crate chewing combined with the negative perception of certain breeds has led to the IATA Container Requirement # 82 (CR82) for «dangerous dog breeds.» (premierpetrelocation.com)
no what that list is, is a series of actual occurrences, that can't be explained thru naturalistic mechanisms. (religion.blogs.cnn.com)