The students should walk out and never return. Being sitting ducks for gun violence is one reason, but it is far from the only one.
1. Students Are Left Defenseless
It's not just crazy gunmen students are left defenseless against. Some schools put cops in the school, which sounds like a good idea. But if they aren't stopping school shootings, they are generally handcuffing non-resistant elementary school students. Other "resource officers" assault the students, or taze them while the Principal holds them down.
The administrations can't address the real issues because they are too busy interrogating five-year-olds until they pee their pants. Every day in the news you see another report of a teacher doing something crazy, assaulting, or sexually abusing students.
Public schools are anything but a "safe space."
2. Taught Obedience, Not Skills
Teens should be rising up and tearing schools apart brick by brick like the Berlin Wall. Their rights have been seized by the state. They are forced to attend with no choice whether to associate with their peers and teachers.
They are told when to eat and must ask permission to use the bathroom. They have no say in what they will learn. And schools even take property and due process rights away from their captive students, forcing them to submit to random searches and seizures.
The Daily Bell article Five Ways Schools Destroy Children's Freedom (and what to do about it) cover this pretty well.
The book Teen 2.0: Saving Our Children and Families from the Torment of Adolescence delves in depth into the history and injustice of compulsory schooling.
It was designed so that the state and corporations could work together to train an obedient workforce, with the public footing the bill.
The point was not open minds and a desire to learn. The aim of the education was setting students up for whatever mediocre to low paying jobs the industrialists wanted them to fill.
It was bad in 1900, and it is no better today. The economy is changing and public schools are not keeping up. So even if you think it is okay for schools to train students to become office drones, they aren't training them for the type of jobs that will even exist in ten years.
Students would be better off exploring the real world and getting job experience through internships and apprenticeships. At least then they would learn a real-world skill, and attitudes which lead to career and business success.
But even more important they wouldn't be forced into mindless obedience and molded by people with ulterior motives.
They would learn the responsibilities and many benefits–including mental health–of freedom.