The fact that the author glosses over the ins and outs of how this school, or world, works, means, in my opinion, that it's not something they think would bring anything to the story, or is not the kind of story they want to tell.
The plot is obviously built on death, blood, drama and strong emotions (of love and others) and is plot/character driven, not "world building" driven.
I can understand how it would be frustrating to some to not have an exposition about how, in a far far away future, Vampire and Human societies interact, how can Vampires "grow up" (do they have parents? Are there any male Vampires?) and why the school doesn't seem to value the well-being or life of the students, but the author decided against laying out explanations, for now or forever.
When Yucca cuts Emielle, it wasn't the school that reacted, but the other girls, because Emielle is popular, not really because she could have died. She even stabbed her feet, but it amounted to nothing. She healed in a matter of minutes. There seems to be a pervasive indifference toward death in that society. Which I can understand, because Vampires are hunted too and death is a common occurrence. When Shiki died, the other students were like "it can't be helped" (and the school didn't call a counselor to talk about it with them... life goes on)
So, actually, I think the author gives answers, but more implicitly than explicitly.
If you're the type that want answers spelled out to you in exposition, it's probably not the series for you.