Mass shooters are pretty much whack-jobs

There is a clear relationship between mental illness and mass public shootings.

At the broadest level, peer-reviewed research has shown that individuals with major mental disorders (those that substantially interfere with life activities) are more likely to commit violent acts, especially if they abuse drugs.

When we focus more narrowly on mass public shootings — an extreme and, fortunately, rare form of violence — we see a relatively high rate of mental illness.

via The Los Angeles Times