You know they have magic aren't you? Even with the latest chapter they mentioning isolation magic. Their opponents might be stronger than the teachers and information or news can get delayed.
That they could also prevent if they have a solid security. Can't their "magic" detect the culprits? They can't even detect anyone before they attack, and they're teaching students to be a hero. The current generation have the knowledge but not the experience.
Well it's a Hero school, the teacher must've want the students to be prepared for any kind of situation
What a school, many things already happened inside and outside that could affect their students, and no actions even from the teachers!?? What? Like 10 people are not currup here?? The heck they even have dragon as vice principal, and they give no visible actions.