1)Staggering amounts of numbers that make it seem like the guns are to blame, because that's the policy goal. No historical data that shows any correlation between guns per person leading to violence per person.There is no good research on the effect of arming teachers or the effect of putting more armed police or security in schools — which by itself should raise red flags, given that policy should be evidence-based. But based on the evidence we do have, there’s enough to suggest that putting more guns in schools could actually make gun violence worse.
1) The research is clear: more guns, more gun deaths
The US is unique in two key — and related — ways when it comes to guns: It has way more gun deaths than other developed nations, and it has far more guns than any other country in the world.
2) For every criminal killed in self-defense, there are dozens more murders
His findings: For every justifiable gun homicide, there were 34 criminal gun homicides, 78 gun suicides, and two accidental gun deaths.
3) Stopping a mass shooting is hard, even with firearms training
Reality, however, is more complicated: Even when people are armed, that doesn’t mean they can properly respond to a mass shooting.
Multiple simulations have demonstrated that most people, if placed in an active shooter situation while armed, will not be able to stop the situation, and may in fact do little more than get themselves killed in the process.
None of that is to say that a “good guy with a gun” wouldn’t ever be able to stop a shooter. We have seen some high-profile cases in which that happened. But the bulk of the findings, from news investigations to the FBI’s report to The Daily Show, suggest that this idea is often going to play out very differently than supporters like Trump envision — and sometimes could lead to more innocent people getting caught in the crossfire.
If America wants to confront its gun violence problem, then, the research suggests it should look to reducing the number of guns in circulation — not putting more armed people into schools.
2) There are so many unreported events, the "justifiable" homicides have to work through the system to be so declared...this is a non-starter, but it SOUNDS scary and statistical. Side Note: These people are using stats, data, hard numbers in to make their case, but can't identify a male or a female...that's on a spectrum. Is reality objective and able to be recorded in data, or is it relative and based on feelings?
3) Well, it can't be done. Nobody can stop this violence. Hello Fatalism
I've got some research for ya...let's draw a line at 1991 and see what we find:
Are we able to reject failed policies that were passed with overwhelming support?2018, February 14 - Marjory Stoneman Douglas High school shootings - (17 deaths)
2017, November 14 - Rancho Tehama Reserve shootings - (6 deaths)
2017, April 10 - North Park Elementary School shooting - (3 deaths)
2015, October 1 - Umpqua Community College shooting - (10 deaths)
2014, October 24 - Marysville Pilchuck High School shooting - (5 deaths)
2013, June 7 - 2013 Santa Monica shooting - (6 deaths)
2013, January 15 - (3 deaths) 
2012, December 14 - Sandy Hook Elementary School shootings - (28 deaths)
2012, April 2 - Oikos University shooting - (7 deaths)
2012, February 27 - Chardon High School shooting - (3 deaths)
2010, February 12 - University of Alabama in Huntsville shooting - (3 deaths)
2008, February 14 - Northern Illinois University shooting - (6 deaths)
2007, April 6 - Virginia Tech massacre - (33 deaths)
2006, October 2 - West Nickel Mines School shooting - (6 deaths)
2005, March 21 - Red Lake shootings - (10 deaths)
2002, January 16 - Appalachian School of Law shooting - (3 deaths)
1999, April 20 - Columbine High School massacre - (15 deaths)
1998, May 21 - Thurston High School shooting - (4 deaths)
1998, March 24 - Mitchell Johnson and Andrew Golden - (5 deaths)
1997, December 1 - Heath High School shooting - (3 deaths)
1997, October 1 - Pearl High School shooting - (3 deaths)
1996, August 15 - San Diego State University shooting - (3 deaths)
1996, February 2 - Frontier Middle School shooting - (3 deaths)
1992, May 1 - Lindhurst High School shooting - (3 deaths)
1991, November 1 - University of Iowa shooting - (6 deaths)
1989, January 17 - Stockton schoolyard shooting - (6 deaths)
1976, July 12 - California State University, Fullerton massacre - (7 deaths)
1974, December 30 - Olean High School shooting - (3 deaths)
1970, May 4 - Kent State shootings - (4 deaths)
1966, November 12 - Mesa, Arizona - (5 deaths) 
1966, August 1 - University of Texas tower shooting - (17 deaths)
1940, May 6 - Pasadena - (5 deaths) 
1898, December 13 - Charleston - (6 deaths) 
1893, March 26 - Plain Dealing high school - (4 deaths) 
1868, December 22 - (3 deaths) 
1764, July 26 - Enoch Brown - (10 deaths)
Stop cherry picking stats about general society that you think have some relation to school violence. Do you want to run an analysis on SSRIs and mass shootings? Single parent households vs violence? We could run an analysis of gallons of soda sold vs violence in the nation. We could analyze the quality of music over the years vs violence. Stop trying to say that you hold to objective, statistical proof about much of anything.
We haven't made the arming of teachers a policy in the past, therefore the data isn't available. We have, however, a great deal of data regarding disarming people in schools.