What I fail to understand is how guns are really going to solve the issue of these school shootings. Almost all of these shooters kill themselves, and even those who aren't are more commonly detained than shot. Someone else providing return fire has rarely, if ever, stopped a shooter, and I sincerely doubt it's a deterrent.
I guess it just boils down to deterrence theory; if we put armed guards in our school, we would be sending several messages to our kids. Some of them might be good, some might not be.
"Our school has things under control."
"Our school is protected by guns."
"Our school protects us with guns."
"Our school is empowered by guns."
"Guns empower people."
"Hey... I wouldn't mind being empowered."
Uh oh. Maybe we're sending the wrong message.
If we want to find the culprit for these shootings, we need to consider what's really causing them in the first place. How many schools in America have had shootings? One in a thousand? One in ten thousand? Not many. What we have now - schools without armed guards - is working pretty well. Also consider how rare these shootings are in other countries, and I don't think many first world countries have their school systems protected by armed guards.
Evidently there's something different about the United States. One theory is that drugs are an issue. Despite the US population being about 300 million out of 7 billion people in the world (4% of the world population), over NINETY percent of the world's pharmaceutical medication is consumed here. That's a huge concentration, and a lot of these are psychoactive medications as well. Additionally, because drug patents only last 20 years, companies continuously come up with new formulas to peddle the patented medication.
I can't draw a direct line between school shootings and psychoactive medication, but there are definitely trends between medication and violent or unusual behavior. A common pattern I see is, "Kid is put on anti-depressants, they work for two years, they stop working, three weeks later the kid hangs himself."
Another issue that's predominantly American is our attitude. Road rage is a lot less common in other countries than in the US. What causes this I can't be sure, but I would definitely argue that it has something to do with our overall attitude.