I think there is an important difference between being asked "ARE you carrying?" and "WHY do you carry?"
I have a broad range of friends, acquaintances and (now former) work associates. Their opinions about guns run the full range.
I respond to the question of "Are you" by answering only those people who already know I would, and whom I trust.
To everyone else I say that I do not answer that question.
One couple we know are stridently anti-gun. When going to their house or any event where they will be present, I know they will demand to know if I am carrying. They will always assert their right under WI law to tell me not to bring it into their house. My practice is to always return to my car and sit in it for a couple minutes, whether I had my gun with me or not. If asked whether I was taking off my gun, I tell them I never answer the question.
I worked with one of them for years - a very competent and desirable work associate. Whenever we met somewhere to perform our duties, she would try to "out" me by asking the question in front of witnesses. Whether carrying or not, back to the car for a minute.
When I told her she was straining our professional relationship, she went off like a nuclear bomb about how no one "needs" a gun. We eventually came to terms about it and she stopped trying to out me in front of others.
People who demand answers to the question will soon figure a way to "out" an armed person, so I always leave an environment where I can be denied my right, whether armed or not. That way there is no difference in my behaviour either way.
"Why" I carry is a completely different question. Answering it does not reveal whether or not I am armed. Gunzine writer John Connor wrote a piece called "Little Lizzie" or something like that. It was an eloquent explanation of his reasons. I'm sure it's online.
Part of it rings resoundingly in my own thoughts: "Because you're not qualified to carry one. You haven't got the skills, the judgment, the sense of responsibility or the courage for it."
Someone else in this thread gave the "grandpa" response. I'll go with that, too. I will not stand idly by and see myself or my family wantonly killed if I have any means to prevent it.