Voluntaryism: The philosophy that holds that all forms of human association should be on a voluntary basis.
If one adheres to reason they must accept the validity of the philosophy of Voluntaryism.
In accepting this philosophy one is accepting the rational proposition that the initiation of the use of force or the threat thereof is wrong. In actual fact one implicitly accepts this every time s/he enters into argument with another individual as the non-aggression principle and the principle of self-ownership/individual sovereignty are presupposed in argumentation, i.e. one cannot argue against either without self-refuting.