I think republicans should pivot into "only a good guy with a truck can stop a bad guy with a gun" because it makes as much sense.
"if the teacher had a 4x4 mazda truck they could run over the attacker if the school was a fully paved parking garage. We should consider making the school cooridors driveable"
its not a serious proposal, the point is neither are security guards, giant fences with barbed wire, or giving every student a weapon. The only successful solution has ever been putting responsibility on gun owners and sellers to be responsible about who they give guns to and when.