You also may want to include in the recipe.
A Leftist Broward County Sheriff who visits the shooter 39 times and never Baker Acts the shooter for obvious mental issues.
A Leftist FBI that ignores a tip that the shooter is going to kill people.
Just maybe the Leftist government leaders and employees want to have people like Nickolas Cruz kill a bunch of people with a gun so these Leftist government leaders and employees have an excuse to take YOUR gun away.
Food for thought.
It was more than one tip to the FBI that was ignored.