It's not that interesting. Honestly, in an emergency, do what you've got to do - just try to minimize your damage to others. A good rule of thumb is: it must be an emergency, avoid putting others at risk, avoid causing more damage than the damage you're trying to prevent, and weigh how much the parties you're affecting will be affected relative to what you need to do. Geez, breaking into a cabin and eating someone else's food because you're starving is so fundamental and so trivial relative to the issues the world faces today.
These emergency situations you bring up are generally understood, and not the underlying basis for the big things that need to be addressed, such as: climate change, disaster management, agriculture, starvation, transportation, national defense, environmental destruction, economic stability, resource management, etc.
Among those listed, the nuke situation falls under disaster management and national defense, but it also relates to all topics just listed.
Those subject matters should be addressed. That doesn't necessarily give anybody the right to make a law to regulate it. That just complicates the issue, but then maybe that's what you're going for -more interesting. I prefer less interesting to more interesting in that case. If you're advocating laws to manipulate and coerce the property owners of others, then you better have a very good reason for doing so.
Here we go. I'm going to get whacked upside the head. I can just feel it coming.
Regarding breaking into the cabin because you're starving: it's not interesting at all because regardless of the political climate, situation, laws, etc., human instinct takes over and you do what you've got to do. These situations usually work themselves out. It's just not really worth exploring in this debate with regard to how it is handled.
However, there is a vast difference in how the big issues are addressed and dealt with depending on the politics. Thus, these issues are worth debating. Pick any one of those topics. They are deep, broad, and complicated.
Consider transportation, and just transportation. We have urban planning, road development and maintenance, rail, aircraft airframe structural integrity, airplane safety, helicopter safety, air traffic safety, right of ways, traffic management, insurance, terrorism potentially targeting air, land or sea (human beings or cargo), boating, car safety, shipping ports, noise abatement, bicycle pathways, delivery of hazardous materials, etc.
How does all this interrelate safely and efficiently? Are there commonly defined protocols?
How about the environment? Ecosystems, species extinction, soil sustainability, aquifers, water quality, riparian zones, trophic cascades, erosion, deforestation, old growth forests, secondary growth forests, fire management, wildlife corridors, cattle grazing, toxic dumping, sewage management, water tables, ocean pollution, air pollution, edge effects, ecosystem fragmentation, ocean currents, styrofoam, plastic bags, tar sands, oil spills, animal poaching (Sumatran Rhino), suburban sprawl, dust pollution (Owens Lake due to the DWP), preserves, etc.