They're never going to admit they're not allowed to do a good job. Throwing the worst-behaving 5% out of the classroom and forcing some discipline on the remaining 95% would both get better results, and make the teachers enjoy their jobs more.
Bad behavior is an issue but not the primary issue. The big issue is allowing deficits to stack year on year without comprehensive intervention involving discipline and diligence from all stakeholders.
Bad behavior is a huge issue. The only reason we pay for private school is because our school is allowed to counsel out misbehaved students. Our studious, obedient daughter would never get equal attention from her teachers in a typical public school.
Yes, the public systems are struggling to manage behavior and iphone addicted parents are not helping the situation. Kids with bad behavior deserve equal attention but should not be sucking all the air out of the classroom, which unfortunately is happening all too often. When that happens ideally there are interventions, discipline, social work, IEPs, medical therapy, and alternate placements. Obviously we cannot ignore such kids (largely boys) or they'll be on their way to prison or otherwise an economic drag on society. I worry especially about all the boys I see who are just not getting out with dad, grandpa, or brothers to get some solid lessons and hard knocks on the playground.