So, off my own property, why don't I carry? In my sixty some years I've never had an experience that convinced me of the value.
You've never used your life insurance, either... but I bet you still keep that policy up-to-date.
You never know when your time to act will come. All you can do is be as prepared as is reasonable. If that is unarmed but aware, you're still better off than most. If you can possibly be both armed and aware of your surroundings, your chances of survival (or the survival of a loved one) increase exponentially.
And, I agree, this thread has outlived its usefulness.