"people may not perceive things to be fair. "

Equally as important (and dangerous) is a) who is the arbiter of what is fair and b) who decides who is the arbiter of this fairness?

Basic survival requires food, water and shelter. Beyond that, it is necessarily subjective because there will always be perspective influencing what someone deserves and what others think someone deserves.

Apart from protecting people from starvation, thirst, disease and freezing/burning to death, I'm not sure how a system could be implemented without an opt-in charity component.