Look, my objection is pretty simple. I would like to see evidence that armed guards are an effective way of saving lives. If armed guards are obviously effective, then it should be easy to provide sound evidence of that. Absent evidence, my suspicion is that armed guards are generally a kind of security theater and not actually an effective way of saving lives. Of course, armed guards may be more effective in some contexts than others.
I think generally when we talk about public policy we expect that policy to be grounded in research and sound science. I don’t think we should leave that expectation at the door just because a policy issue involves guns. The same applies to gun control measures: there should be sound research before a government enacts (for example) a gun registration scheme.
e: One more for the anecdote pile. While looking for papers on armed guards, I found this gem:
In the 41,000-student Tulsa, Okla., school district, uniformed guards stationed at all public high schools and middle schools are not police officers, but nonetheless carry firearms, said district spokesman John Hamill. The armed guards, which the school system has used for a decade, are provided currently under a contract with Securitas Security Services USA, the Parsippany, N.J.-based division of a Swedish company.
The 65 guards are equipped with handguns, said Bob Currington, the district security coordinator. The number of guards at schools ranges from one to five, based on the circumstances of each school.
“The firearm is there to protect students from bad guys on the outside, not to use on students,” Mr. Hamill said. To underscore the dangers facing schools today, he cited a campus lockdown during a pawnshop robbery near a school two years ago, and another incident in which a criminal suspect fleeing arrest entered and dashed through an elementary school.
In addition, the district deploys nine school resource officers, underwritten by the federal COPS grants, with each one covering several schools.
The security guards all have earned the standard law-enforcement certification in safe weapons use, according to Mr. Hamill. However, a mishap occurred on the only occasion in the past five years in which a guard has taken out his firearm. In October 2002, according to press reports at the time and Mr. Hamill, a guard outside a Tulsa high school saw an expelled student who appeared to be threatening him with a weapon; the guard fired his pistol; the bullet ricocheted and fragments hit another student in the cheek; no weapon was recovered. The district paid a legal settlement to the injured student and his parents.
Trotter, Andrew, “Schools Wrestle With Issue of Armed Guards” (2005) 24 Education Week 1.