Why the **** are we talking about what to call it? What name to file this horrible act under? The bodies aren't even in the ground yet. Have some class and recognize the privilege that you have of being able to sit here and discuss semantics instead of having to bury someone. Save it for another time.
This is a tragedy, another horrible loss of life for no reason any of us will ever understand. My deepest condolence to anyone impacted by this, and my sincerest admiration for the rave men and women that ran towards the sound of gunfire, ending the horror and tending to the victims.