And how does free loading on others avoid the non-aggression principle? Do you have examples of where voluntary taxation exists and works?

Do you think turning societies into country clubs is really workable, as in, does it scale? Tax payers are in effect members of civil society, but we have a technology that enables us to identify non-members so that we can each choose whether, and how, to exclude non-members from social and business ventures?

There are plenty of third world countries where you can pretty much avoid taxation, but it hasn't worked out terribly well for them.

There are benefits to belonging to civilisation. Voluntary taxation is just not realistic.

Letting a child starve doesn't violate the non-aggression principle either.