A gun is a tool. Tools withdraw from total access. Therefore they can do things that you don't want them to do.
A gun can go off without your conscious intention, killing your son (this happened quite recently in PA).
Your ideas about reality can force you to buy four guns, not one. (Did I mention that ideas are also tools that are withdrawn from access? Call them memes, call them intentional objects, whatever.)
Your psychopathic son can take these guns, kill you, and then go on a rampage. You did not consciously intend this.
Tools are withdrawn from total access. They can do things that surprise me. Therefore it would be best severely to limit the number of guns I can own, and their type. Assuming that is, that we decide that it is best if some people should have some access to guns at all.
Someone was wondering "how OOO helps" in the case of PA killing. This in part is a response to that question.
People kill people like the NRA says. Also, guns kill people, like the NRA doesn't say.