My calculus on mass shootings has much less to do with the number of victims than with the intent of the perpetrator.Doesn't matter whether its 3 or 12, still actually less likely to be a white shooter.
But don't let facts ruin your myth, since it seems very important to you.
If a road rage incident ends up with someone pulling out a gun and killing the three-plus occupants of the other vehicle, to me, that's not a mass shooting.
If a fight outside a bar ends up with someone coming back to get revenge and shooting the three-plus combatants on the other side, to me, that's not a mass shooting.
If some teenager comes to an elementary school armed to the hilt with weaponry available to him in no small part, one can surmise, because his mother received $200,000 a year in alimony, and carries out his intention - committing a mass shooting - to me, that's a mass shooting.