In other words, if you assign a probability of 1 against a Kristallnacht scenario, then nearly all your self-defense effort should be spent on your own security and nothing on community.
On the other hand, if you assign a probability of 1 against a Jericho style scenario where either foreign invaders or neighboring town or an illegitimate federal govt attacks your town then maybe 1/3rd-2/3rd split might work.
The idea is, firearms are possibly the most effective protective measure you can use in all situations, things like clean water preparation might not help you if you're worried about Kristallnacht.
