That would be because grade schools are for general education. You are taught fundamental skills to enable critical thinking, analysis, literacy, problem solving, socialization, responsibility, organization, and so on... These are tools you will use every day to solve far more complex and dynamic issues in your life, such as dealing with family issues.
Teachers are already greatly overworked and vastly underpaid all around the world for the important contribution they provide to a functioning society. Shifting the blame from poor parenting to the teachers and schools is all too common; it is not their responsibility to be your child's mother, father, or guardian.
That said, the reduction in funding and de-emphasis on home economic classes and push towards standardized testing has definitely been a major step backwards. Basic first aid, budget balancing, simple cooking, etc are areas that need to be addressed in a structured environment to help fill in gaps a young student may not be properly exposed to in their home environment.
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