It is always the parents. What is the point of sending children to school to learn if all they are going to meet when they get home is anger that will mess up everything? Children learn manners discipline and responsibility in school. Nothing works if the mood at home is noisy, stressful and wrong.
Teachers work hard at teaching students. There are rules in school homeworks and grades. When students get home all that goes for a toss because adults at home do not care anymore except to push the children in one direction. Some parents demand respect from their children. I do not agree to that method at all. You end up teaching your child how to be disrespectful, when you're always pushing. Then they blame schools for the poor performance of their children. That is why there has been a change from work or fail to nobody should fail. This change is not about the quality of education or money. Too many parents would have turned down any trying by the schools to bring bad news about their children's performance in school.
Teachers had to deal with a lot of parents who felt blamed. These are parents who did not like questions like how can we help your child? These guys took it personally. The worst thing for parents was for schools to tell them that their children were lazy and ill mannered. Parents did not like what they heard.
Over time schools began to soften their words because they wanted to avoid parental anger. This change was the result of homes where adults refuse to take responsibility. Children cannot learn in school then be broken every day at home. If parents make the problem worse the whole system will suffer.