This is the kind of nut that goes off the rails. More likely thought he will incite some impressionable student to commit the crime. What seems like a metaphor to him may be interpreted differently by someone.
But, but, but, crosshairs was a threat according to the left, not a metaphor. Sounds like the lad, cause he certainly is not a man, needs some woodshed edumacationing. Metaphorically speaking, of course!
Gunner