Here's the problem with placing a police officer in every school. Gangs. What does a single armed police officer do when confronted with a gang of criminals wishing to inflict harm on the children? If he values his own life, he stays out of the way. At least if teachers and administrators are all armed, even a gang storming a school will have less chance of success if there are equal or greater numbers of armed people inside waiting for them. If it keeps the terrorists out of the schools in Israel, it will keep the gang members out here.