If you’re talking about the book Hatchet, then I believe it is because Brian is alone, it will be cold, harder to keep warm, harder to find food because not as many animals put, harder to keep fire going.
Although it unfortunately has been forgotten by many, Jesus preached a message of peace and cooperation, most notably embodied in the phrase" love thy neighbor". It spread because people were refreshed by his words.
Adam was seen as representing the commercial, New England in interests while Jackson represented the common man, especially on the frontier
People who were not free were slaves as they did not have the rights to their own life at that time. So only free people were allowed the rights of the Magna carta
I think that you just answered your own question in the question you asked.