Im going to play devils advocate here and will give the op the benefit of the doubt. I have friends, and relatives, that are too loose with their firearms. So much to the point that I will not leave my children with them. We, as gun owners, have a responsibility, in our own homes and our controlled surroundings(car, office), to ensure our loaded firearms, cannot be compromised. For example, I have a relative who is a cop. He has four pistols that I know of that are unlocked, loaded, and chambered throughout his house. Guess what, my kids are not coming over. I have another uncle that will leave loaded rifles laying around his farmhouse. Again, not smart. Not when you have dozens of people visiting you at any given time.
I dont think the OP is referring to your own protection. He is talking about common sense measures. If your kids, or you for that matter, came to my house, you could spend all the time you needed trying to find and utilize my firearms. And you would not succeed. But I can be downstairs, or upstairs, and arm myself to a threat within seconds. Be responsible.