That's just the established naming convention. For brown bears, you have parvorder Ursida, superfamily Ursoidea, family Ursidae, subfamily Ursinae, tribe Ursini, genus Ursus, and finally species Ursus arctos. When there are millions of taxonomic names, you want to establish some kind of regular structure, because you are going to run out of useful distinctive names.

I agree, but it is clear they got used to it. I suppose once you learn the endings, you can generate the higher genera from the name of a bottom level species familar to us like human-cat-dog / homo-felis-canis

Superfamily -oidea

  Hominoidea | Feloidea | Canoidea |

Family -idae

  Hominidae | Felidae | Canidae |

Subfamily -inae

  Homininae | Felinae (Small cats) | Caninae |

Tribe -ini

  Hominini | Felini | Canini |

Subtribe -ina

  Hominina | Felina | Canina |

Homie, no idea.

[Sorry I never joke but surely the biologists were joking when they came up with that so it should be fair game]