Anonymous
Whirlibird, you can only eat what’s available. There are no magic wands. If you have more knowledge than the average person it’ll take you further. If the competition is too strong, you’ll need to move around until you find a place that works for.
We do not populate every inch of this planet and there are many great techniques and even more being developed to make the most out what’s available to grow plenty of food for everyone. Of course, we don’t need to to get by individually.
An obvious answer to your question is self-defense and defending what you claim as yours. There are many dimensions to view the many issues we will face in SHTF and you seem to choose to view the “why bother” dimension. I won’t join you there.