A big difference between private schools and urban public schools is the level of parent involvement. I've seen both up close and personal. It's not just involvement in school functions but involvement in their kid's education before and after school as well. The kids that are acting out in school probably don't have parents who can/will be involved in their homework, who can take the call during school hours or come in to meet their kid's teachers.
If the kids are raised by single parents, parents who have to work long and underpaid hours or parents who have substance abuse and/or crime issues the best teacher in the world will not, in most cases, be able to have impact. Yes, there are exceptions. And teachers need to be accountable for what they do in their classrooms. But the pervasive problems can't just be blamed on the teachers alone, the problems need to be addressed by promoting family support systems, promoting teachers who care and school systems provisioned with resources.
If the kids are raised by single parents, parents who have to work long and underpaid hours or parents who have substance abuse and/or crime issues the best teacher in the world will not, in most cases, be able to have impact. Yes, there are exceptions. And teachers need to be accountable for what they do in their classrooms. But the pervasive problems can't just be blamed on the teachers alone, the problems need to be addressed by promoting family support systems, promoting teachers who care and school systems provisioned with resources.