In considering the probability of nuclear war or other catastrophe in the near future, I foresee that some Catholics will need to evacuate their own homes. Even some "bug out" homes may be contaminated, inadequate, or unsafe for a variety of reasons (plague, fallout, no irrigation, marauders, feudal lords, etc.) . In relocating it may be necessary to survive by squatting on unoccupied properties, the owners of which may have already succuмbed or or may be unable to make use of the property to which they hold title.
Of course it is not an option to force others out of their own occupied homes, but what of squatting?
I'd be interested to hear application of relevant Catholic moral theology to this hypothetical.