Yes, Xarthaz hits it on the head. The harsh reality is that there is no such thing as a protection agency. There are only exploiters and monopolist-exploiters. Or stated another way there are only common thugs or states. As Hoppe said in “Democracy: TGTF,” we only want competition in the production of goods, but we do not want competition it in the production of bads.
A monopolist exploiter is less bad than competing exploiters for the same reason that owned resources are “better-off” than unowned ones. If an exploiter is not a monopolist, his incentive will be to exploit as much, and as quickly, as possible. A monopolist exploiter has taken (by force) sole exploitative access to a given region and thus will try to preserve his asset (you). It is a bleak view of reality, but history shows this to be the case. Nature is harsh, the strong eat the weak.
If you accept the inevitability of this, it becomes clear that the only humane path any Libertarian can take is to depose and replace the monopolist exploiter (peacefully if possible). He can then usher in a society structured on sound economics, freedom oriented policy, and general libertarian principles which could last many years. Sure society would devolve back into a tyrannical state of affairs after some time. But by then the revolutionaries, their children, and maybe even their children’s children will be dead. How far into the future do you want to influence anyway? This is essentially what our founders accomplished. Since we are all mortal, it is either now or never.