I am lucky enough to live in one of those idyllic places out in the country where I have never felt threatened, but I have to agree with Kevin's statement above and am in the process of getting the proper training so that my wife and I can modify our habits accordingly.
Like many others here, I have never felt the need to keep a gun in the shop for self-defense. Unfortunately our society is changing and is facing some significant issues - one of which is that far to many people today have no respect for anything, most significantly life itself (refer back to the tragic story of the firefighter). With age comes a desire to keep the playing field level after the youthful sense of invincibility has faded.
How you level the playing field is a personal decision, the primary method discussed in this thread requires proper training and incredibly high level of responsibility which should not be taken lightly.
I wonder whether (primarily based on the Tueller Drill) most people would be better off with an "edge weapon" of some type for self-defense as it is highly effective and requires far less training than a firearm.
Just a couple thoughts to ponder,
GD