AFAI am concerned, libertarians are free to replace most of government with charity and other voluntary associations as soon as they find a way around the free

AFAI am concerned, libertarians are free to replace most of government with charity and other voluntary associations as soon as they find a way around the free rider problem and assorted other coordination problems that isn't 1) government (we already have that!), or 2) obviously worse than government. Good effing luck!