I saw this article from Screen Rant. Wonderful article mind you, it makes me curious that those the points gathered there are very valid to the school must be shut down especially when Voldemort returned. However, I don't agree with the 9th and 5th one. In Harry Potter and the Chamber of Secrets, Professor McGonagall was worried about what's happening to the students regarding the basilisk's attack.
Students must be sent home, I'm afraid this would be the end of Hogwarts.
Though I'm not sure if she said that in the book, but that's not the point here. The point here is that danger that is happening in Hogwarts. It's so ridiculous that Hogwarts is a school that doesn't prioritize the safety of the students. Shall I put the list for you and I will just copy it from the article if you don't mind =).
- The Chamber of Secrets opened twice
Good point! The first time the Chamber of Secrets was opened was when Voldemort was at school. He opened the Chamber and set the basilisk on Muggle-born students and then blamed everything on Hagrid. The school should have shut down when the attacks kept going on, but it definitely should have been shut down after Moaning Myrtle died. The death of a student and the fact that other students were petrified is a good reason to shut the school down for a while. Considering the fact that the first time the Chamber of Secrets was opened that a student died, you would think it reopening a second time would be good enough reason to close the school right away. Given that Hagrid and others were alive and a part of what happened, it’s not like it was that long ago. The school should have been closed once the first attack happened and not reopened again until the monster had been identified and stopped.
- Umbridge used Physical Punishments
Potterhead fans almost hated her more than the Dark Lord himself. While Voldemort was often one of the worst things to happen to Hogwarts, Umbridge was almost as bad. She might not have been in league with Voldemort at the time, but she was truly vile. She used physical torture as punishment during detentions by making students carve words into the back of their hands over and over. This is a completely wild thing to happen, and the school should have been shut down once this started happening.
- When Voldemort possesses Quirrell
During Harry Potter's time at Hogwarts, there were multiple times when Voldemort and his plans to come back to power put Harry and all the other students at risk. This started early on in Harry’s first year. It was pretty ridiculous that Dumbledore housed the Sorcerer’s Stone at Hogwarts in the first place. But, after Quirrell, who had Voldemort on the back of his head, tried to kill Harry to get the stone, there should have at least been some sort of inquiry. Instead, things just went right back to normal.
- Cedric Diggory died at the Triwizard Tournament
This is one of the most horrifying things that happened to a Hogwarts student during Harry’s time at the school. While Cedric didn’t actually die at the school, he did die under mysterious circumstances that were connected to a school event.The Triwizard Tournament was so dangerous anyway that it shouldn’t have been reinstated. After Cedric died, some serious consideration about the school and its safety measures should have happened.
- When Voldemort came back to power
After Voldemort came back to power at the end of The Goblet of Fire, it would have been wise to just shut Hogwarts down. Of course, the Ministry didn’t actually want to admit he was back, but after it was confirmed, Hogwarts should have been shut down for a time. While lots of people insisted that being around Dumbledore was the safest place to be, clearly this isn't actually true as so many bad things happened at the school.
- A Dark secret from a Defense against the Dark Arts Teacher
So many of the Defense Against the Dark Arts teachers posed a safety risk to the students. First, there was Quirrell, and then there was Lockhart who was a fraud,Lupin a werewolf,Moody who was actually a Death Eater impersonating the Auror and of course, Umbridge. While Snape is the loathsome of most students, Dumbledore needed him to accomplish the plan. Considering how many professors were horrible to the students, it would have been a good idea to shut the school down and rethink it.
- After the Battle of Hogwarts
This is interesting.One of the most tragic things that ever happened at Hogwarts was the Battle of Hogwarts. This battle ended the lives of multiple people, including one who was a student at the time. The fact that the school ever reopened after this doesn't make a lot of sense.It’s basically the source of a lot of trauma for many of the students and their families, so it would make more sense to move the wizarding school to some other location.
So all of those events that gathered from Steele (the article writer) makes a valid reason to stop sending students to Hogwarts every year.
REFERENCE: https://screenrant.com/harry-potter-hogwarts-shut-down/