That just it, the snow people - the species will not survive without helping each other. Morals come into play if someone is stuck in the snow , stranded. They will die even if they are strong. Even if they are smart. Nature is respected and powerful. To survive you need to have help from your clan, and you all have to be smart to shield yourself from the elements, hunt for food, reproduce. Left alone you will die. It becomes what can we get so we are the strongest clan. The jungle people do not worry about the elements. Food is plentiful. The biggest danger is overpopulation. Kill a few and the species will not die off, don't kill them and they may take your food. Leave them alone, they will live without moving very far. It's is about what can I get for myself so I am the strongest person. As a result, the snow people are genetically programed to help others the jungle people are programmed to take from others.