I see it as an idealogical problem. For example, the people who are so vehemently against the idea of armed guards in schools, trained ones at that, would have you believe that they are only against it because it is cost prohibitive, the fact that a nationwide gun confiscation plan would cost multitudes more notwithstanding. The reason they have an aversion to the idea is because they have a deep aversion to firearms. They have been led to believe that a nation or world devoid of arms is a utopia devoid of evil. They look to Britain and Australia as examples of what we should be, completely blinding themselves to the rampant crime in either of those places despite their strict laws. I see this as one of the reasons why people who are faced with evil suddenly change their entire outlook. Their entire lives, they are kept in a bubble devoid of crime, yet they see the crime from outside of their bubble and are told what to believe and support in order to wrap the whole world in that same bubble. Once that bubble pops, whether it be via a man or woman with a knife or a gun or even merely their own hands, they are exposed to that first biting cold of the outside and are made to realize that their utopia is nothing but an illusion. Some try to scamper back in, maybe pull together another membrane of protective womb against their exposed skin, but at that point they at least know: the world is sunshine and rainbows, sure, but it's also chock full of men and women who are ready and willing to kill and commit atrocities regardless of laws, regardless of utopian ideals, and most certainly regardless of arms.