That is a problem right there. The Left decided to use the schools to forward their agenda instead of teach.
The worst of the problems - the true extent of school violence, the utter chaos in some of the classrooms, the fraudulent grading and promotion practices, the widespread contempt heaped upon the students, and the scandalous lack of parental involvement - have not yet been fully and honestly revealed.
Real progress and real reform won't happen without an understanding of the real truth.
These are symptoms. The real problem is discipline and respect for authority. These have been eroded as relativism has taken over. This is a worldview issue. The Left have spent the last 100 years or so propogating a secular worldview and then sit back in dismay at what they have wrought. It has taken a long time to get to where we are and will take a long time to get back. That is, if we are willing to turn.