Forgive me asking but which country do you live in.

I often have debates with my wife about country vs city living, but I don't think buying a gun / attack dog / big security system ever comes into the equation. (UK based).

Am I not paranoid enough, are you over paranoid? Is there a Bayesian equation we need here?

Just to put up an alternative I just read this https://news.ycombinator.com/item?id=26411899

The guy cycled through Europe and India, met some guy in a bar in Italy and ended up sleeping on his couch and eating home cooked Pasta lunch the next day. A different approach would be to drive with a gun under the seat. I think something is missing.