Anyone with Access

The jury's in.  It's impossible to tell who's going to pick up a gun and start shooting.

Some of the school shootings have been blamed on the victims--they must have bullied their murderers somewhere along the line.  Others have been blamed on the shooters' parents--they must not have brought their children up right.  Some have been blamed on the shooters' own unique psyches--they must have been resentful outsiders. But the shooting in Washington state belies all of these pop psychology explanations.  The shooter, who targeted his own relatives, was an insider, a popular football hero, and his family was supportive and loving.

Who will the next shooter be?  Anyone with access.