"Someone ever tries to kill you, you try to kill 'em right back!" - Captain Mal, Firefly

I've been introducing my family into the world of gun ownership and why I feel the need to own such.  I think my mom is accepting it a lot easier than my dad, of course I've eased her into the idea, and my dad has just only found out that I do in fact own guns, and have my conceal carry license, and that I do, in fact, carry.    I have agreed, out of respect of their wishes, to not carry in their home.  It all comes down to the fact that they fear guns will be used for evil purposes instead of good.  I can understand that fear, because that's the same fear of guns that has driven me to understand the mechanics of a gun, learning to shoot, and learn to use it as a tool of defense, to include of my arsenal of self-defense knowledge.
I'm the least confrontational person I know.  My fight or flight response is complete avoidance, if possible.  It takes a lot to make me angry, and even more to get me to react with violence. (I won't say I've never reacted with violence in anger, because that's just not true.  There are ways of pushing my buttons.) My intentions for having a gun is definitely for good purposes.  I'm not going to shoot every person doing something wrong - if you want my money, fine, take it, it's replaceable.  Human life is not.  No physical harm will come to me or to those I love without bullets put into you at a high rate of speed.
I try to explain the rationale like it was once explained to me:  the gun is a tool.  It will not work unless you manipulate the tool.  A car is a tool.  It will not work unless you manipulate the tool.  Why you manipulate the tool, i.e., your intentions for use, is more fearsome than the tool itself.   When you're behind the wheel of your car, you're in control.  You know what you are doing, where you are going, and how to stay safe.  What you don't have control of is other drivers.  You need to be aware of what they are doing, so that no harm can come to you and the passengers of your vehicle.  Having a gun, and being responsible with it, is very similar.  When you're behind the gun, you are in control.  You need to know what you are doing, where you are aiming, and how to stay safe.  What you don't have control of is other people.  You need to be aware of what they are doing, so that they will not harm you or others.
The world is a crazy place, and it's only getting crazier.  I want to be prepared for anything that could happen.  I just hope that my family can understand, and feel a little safer knowing I'm prepared.