So, my aunt is against my guns and so is my father in law and they try and antagonize me with the "why do you need..." Questions... My answer always lays around the "I want equal or greater opposite force" argument.
Then... They (and most) revert to the "what's really going to happen at your house in your neighborhood" question as if I'm going to feel safe. I have the best low conflict question for them.
I simply say 2 things:
1. "Would you want me to be carrying right now" if the exception (something bad, that instant, my house, nice neighborhood). They pause, reflect, and then say "yes".
2. I remind them that the "it won't happen here, it won't happen to us" comment once applied to movie theaters 5 years ago...