Really? Why not simply have the school bus abducted by negroes bent on cooking and eating the kids or homosexual priests bent on abusing them??
Well really now, I think the schools could see how un- PC your suggestion would be, and they can't come down on Middle Easterners either, for the same stupid PC reason. (/sarcasm) It eventually comes down to the fact that the only "bad guys" we can ever have anymore are white persons of Jewish or Christian background. (and maybe the Jews can wrangle a pass, after all they vote 80% with the teacher's union.) This while almost every terror act in modern times was the result of fanatic supporters of world wide islam brought about by the deaths of innocent children until the west caves in.
But home schoolers represent a serious threat to the public school system and their corrupt unions. How much better to use this exercise to "kill off" their enemy as well as plan for the eventual terrorist act that they will see in this country. BTW you can be sure that guns in the hands of school officials will NOT play a role in this exercise.