@LordFu: BS you can think about abstractions and we do all the time. And there are abstractions dealing with how society should live. Libertarianism is also an abstraction. Dont throw that in, you have much better arguments for what you believe..
And I guess you mean the rest should be left to the individuals. That is why i called it 'societial systems', because i do not know a better name that covers the whole. I guess the purpose of libertarianism would at least roughly lie in the second point of OP.