Let's consider this in the form of a scenario; shall we?
So, you're just going to pick your child up from school... Can't have your carry gun with you on school grounds so you decide to leave it at home, secured.
Your child's teacher wants to discuss an issue with you, delaying your return home for 15 minutes.
You get back home, walk inside and know something isn't right.
While you were gone someone broke into your home and now you've returned while they are still there (happens often enough in real life doesn't it?). You are standing between them and your homes exits but your firearms are "properly secured" and not available to you (at least not quickly).
What do you suppose the likely outcome of this will be? Are you willing to gamble the lives of you and your family to find out?