This point is absurd. If I wanted to kill you and your family do you think that you having a gun could stop me. Good luck with that thinking. Even if you had a gun, you probably dont know how to use it properly (the biggest problem with a majotrity of gun owners), and you probably will end up shooting your own family, or missing the intruder that you intended to kill.
See the reality of shooting an intruder is this. You probably have never shot a person, shot at a person, or pointed a loaded gun at a person with the intent to kill said person. The intruder probably has, making it much harder for you to pull the trigger, thus giving the intruder the split second advantage to blow you away.
Wanna know what stops intruders from coming into my house. The 2 brindle pitbulls in my yard.