Ensure that the appropriate professionals are on hand to address issues. Do not ask people to address issues they are not trained to handle. Keep the school doors open after the classes end. Develop more alternative settings for students who cannot succeed in public schools. Bring back respect of educational professionals.
Low pay is an issue.
Let teachers teach and keep their other duties to a minimum. Do not expect teachers to be mental health professionals, police, etc. Help students learn interpersonal skills, respect, conflict resolution, anger management, assertiveness. Start early and reinforce throughout schooling. Involve students in discussing ideas to address problems.