We can definitely make systemic changes that help people make better "decisions." I don't believe in free will and you clearly do so we're kinda approaching this problem from fundamentally different frameworks. Stupid people shouldn't be culled but rather shepherded. Governments are artificial constructs so asking them to act "naturally" doesn't make sense to me as they have no natural state.
Also reducing human suffering seems to be a pretty good thing to do and your natural system doesn't seem to do that.
Also reducing human suffering seems to be a pretty good thing to do and your natural system doesn't seem to do that.