Who says that the reason for a government to exist is the protection of property?  From what I've learned, the reason for the existence of government is the protection of people from those people who seek to cause harm.  If people would come to the place of agreement that telling the truth resolves everything, while causing harm resolves nothing, then government would become obsolete.  Of course, those who take offense at the truth tend to interpret that as being harmed by it, and respond with harmful retaliation to the messenger.  This in turn not only justifies the existence of government, but creates the conditions for it to proliferate in the varying aspects of people's life.