Yes a topic that should be considered, discussed. My personal answer is to live someplace where I am not as worried about 'what if.' So I do not stress out. I'm now, due to health reasons as a senior, more in civilization. My small community of Nenana Alaska has 300 people.... but depends on one road for supplies with a bridge across a river. We get earthquakes, floods, and power outages. Supply lines fail. Power could potentially go out for weeks to months. We are not so far away from a top secret strategically important military base that could potentially be a target in a war. I like that the community is aware, and as a community discuss various plans. Such as the highest ground is the school, so if there is a flood head for the school to stay, drop off supplies, help others etc. We discuss food stashes and such in case of supply lines cut off. We teach some simple survival, how to put up food, stay warm, ways to live without electric and such. I like the idea of 'just 300 people.' I am more likely in an emergency to know them, know who to trust, who is capable, who to partner up with etc. We are a subsistence village so a lot of knowledge of wilderness survival, homestead, remote life , use of sled dogs, gardening, making your own power, and such topics. A big issue in a more civilized place as you discuss is defense. Riots, looting, bad people surviving off 'you,' who is known ot have stockpiled gear 'they,' want. I just see in the news what happens when the power goes off for a few hours. It seems harder to have the mentality of wanting to hurt people to survive when you know everyone. I like to think, more likely to be willing to work together. As seems proven by being concerned by the potential, and having a community plan. My view as well is... a disaster may not be immediate! But is already upon us! "Now!" Money tight not everyone can afford the minimal survival stuff- food costs rent getting beyond more peoples means to take care of themselves. Pollution on the rise, inability to get medical help, all adding to the stress of everyone, road rage, random senseless no survival behavior we all are effected by. We all have a plan for wherever we are in defense of a lifestyle we believe in and trust and or are good at.
Much can not be planned on! I was a homesteader 100 miles in the wilds with a lifetime of supplies! Food, tools, guns, a way to take care of everything required to support life. Whatever the rest of the world did was not my business, I had my own battle plan. Till a forest fire wiped it all out. It was civilization that saved my bacon. Others I knew had health issues and so their fortress in the wilds had to be walked away from. Time changes all things. We cannot foresee the future for certainty, so my thought is to remain adaptable. Have the ability to change, accept it adopt, prosper. under a variety of conditions. Develop a variety of skills. For example I became among other things aq knife maker, keeping in mind no matter where you are, you need a knife. A very tradable skill useful in every environment. Trade knives for transportation, food etc etc. I look around, we are not talking some potential future disaster. We have already arrived. We are already in ending times. The Lemming are going off the cliff. Not a stampede yet.... but unexplainable weirdness.
https://www.youtube.com/playlist?list=PLE6rGYHPMIY0mjRI1K0-D6M6RNS7BDD7c I have some Utube of interest, on topic.