I get the feeling that the OP is either trolling for another doomsday thread or awfully naive about cruising. There is an extended thread on CF about using a sailboat to survive a "collapse" of western civilization that discussed all of that subject and more. Short of an "extinction event" - e.g. what took out the dinosaurs - using a cruising boat to "escape" is neither practical or viable unless you are a "frontiersman" type person trained to live off the land and seas. Hollywood's version of armageddan is neither realistic or plausible but makes a great movie
theme for people who have not traveled the real world.
- - But more to the point, there are more "good" places to cruise
to than there are bad places. You can use up a lifetime visiting them and you do not need an arsenal to get there. Simple common sense security
practices while sailing/anchoring/mooring will greatly reduce any "bad experiences" just like living in a "good neighborhood" and having locks on your doors does on land.
- - So I suggest trashing all those "end of the world" concerns and concentrate on finding a suitable boat to live comfortably while exploring the nice places of the world. Thousands of cruising couples and singles are all ready currently doing exactly that with great success and enjoyment.
- - There are, of course, quite a few cruisers who think living on a cruising boat is akin to living in the "garden of Eden" and simple security
precautions should not be necessary. They are probably on the opposite pole from those that think they need overwhelming firepower. Reality is that most of cruising fits neatly halfway in between the two poles.
- - Catamarans make wonderful traveling homes for somebody who is not restricted by having to do the "minimalist budget" thing that is described in another good CF thread. There are numerous discussions about what this brand cat offers versus that brand cat but most of all you need to visit boatshows and see for yourself what brand is attractive to you and your shipmate(s). Then within the parameters of cats that are "live-able" to your tastes you can research
the ones with the best performance and reliability