When I started teaching 20 years ago I dealt with a lot of low level disruption from the kids, the odd fistfight, one or two truants across the school. If a kid didn't turn up to lesson it was their own fault, all I had to do was keep a record of it when questioned about their lack of progress to increase my pay. We had two drug dealers on site who were permanently excluded. We had a few instances of bullying, and the bullies, and the one kid attacking another with a pair of scissors, were all permanently excluded.
These days, people truanting from lessons is normal in all apart from our very top sets. They often hide in toilets, but many just wander the site and run away from staff all day long. The one or two persistent truants I had 20 years ago are now 12-15 truants in the same size school. So on call staff never come, because they're chasing those kids, making behaviour in lessons worse.
Bullying is rife all day, online and offline, and the kids get, maybe, one day in isolation. I get told to fuck off almost daily and nothing happens. Because the bigger issues we have are on-site drug dealing while being required to keep the dealers in school, sex, self-harm, fights barely getting a day in isolation because of rules that say we can't exclude, kids who should not be in mainstream who cannot access the curriculum and then display violent behaviour.
We do what we can to keep kids and staff safe. Staff also have to enforce all kids attending lessons because if they don't get their target grade despite being high as kites/ pregnant/ persistently running off from lessons and staff trying to get them back into lessons/ on their phones all the time/ disrupting lessons to the point we cannot teach, then we, staff, get penalised for it.
So yes, schools are run like prison camps. They're impossible institutions to work in under the parameters given. Blame the successive governments of our time running them into the ground.