People are raised to solve problems with violence and fighting. Much of the violence is during lunch, after school and late at night outside of school. Poverty or income level around schools. Gang problem greater at elementary and junior high schools than high schools because great high school population allows for more ease of finding a group to join, gang members drop out around high school grade and students are more mature in high school. Neighborhoods surrounding schools have violent problems.
Violence drives good teachers away.
Have more teen centers and activities like dances, have dances at parks. Have inside activities after school at the school. Advertise activities through schools. Equalize school funding. Improve schools and surrounding neighborhoods will improve.