I grew up in Redneck central, and gun control wasn't very strict. In fact, my bus driver from middle school carried a 12 guage beside him in the seat. If he saw a deer beside the road, he'd stop, get out, and shoot it.
Now, you can be sent to prison for that. And I do agree that schools are very vulnerable to attacks.
My high school had around 1100 kids and had only 2 armed officers in the building. I could have easily brought a gun or bomb into the building and never been noticed.