Here are 2 facts from major publications:
"Recent studies reveal that over the last three decades, 90 percent of high school or elementary school shootings were the result of White, often upper-middle class, perpetrators. The United States Secret Service published a study regarding 37 school shooting incidents in the United States from 1974 through June 2000, which warned against the belief that a certain "type" of student would be a perpetrator.
According to the study, any profile could apply to any student and might not apply to a potential perpetrator. The study reported that school shooters lived with both parents in "an ideal, All-American family." Some perpetrators were children of divorce, or lived in foster homes. A few were loners, but most had close friends."