If you built that raft using plans, materials, and labor of society, then you risk your life to go out to the deep water to get food, then your contribution is just the last bit. To suggest it’s so important that the others involved deserve no spoils of your work (put another way - you say your effort deserves more spoils or sole control of the spoils) - then you’re selfish at the very least (although I’d say you’re among the worst kinds of humans to share society with) and exactly the reason why laws that extract aggressively from the wealthy are the only way to inch capitalism toward something resembling equity for most.