Another way to look at it is that any thing could happen to any one at any time, even if the odds are long.. I don't expect to have a fire, but I have fire extinguishers in the house and cars.Totally respect that. But I think of preparedness as having some standard of probability. I'm ready for things that there's any real chance of happening, like a storm or a blackout or some kind of economic disruption. For me - just speaking for myself here - having to defend my home from other humans is pretty remote. I live in a country where there were 554 murders nationally last year, the vast majority involving people who knew each other. There were four times as many traffic deaths. It's just not something I worry about. If I lived elsewhere, I'm sure I'd reconsider, and I certainly acknowledge everyone's freedom to set their own risk tolerances.