Teachers, social workers, and guidance counselors tried repeatedly to help Nicolas Cruz. His aberrant behavior started in middle school. He was known as a problem. He was referred for therapy. He was sent to a school for emotionally disturbed youth.

https://www.washingtonpost.com/local/education/teachers-say-florida-shooters-problems-started-in-middle-school-and-the-system-tried-to-help-him/2018/02/18/cdff7aa6-1413-11e8-9065-e55346f6de81_story.html

Security guards were alerted to search his backpack for guns.

Why was this very troubled, very angry young allowed to buy a gun?