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Sounds like a voluntary buy in someone can opt into or not. The problem with framing that collective buy in is without it would leave people victims to tribalism so a stronger force would conquer without the minarchy. It's a paradox of tolerance issue. It's about striking a balance.

stronger force would conquer

Without gov'ts, and only having neighbors, why would anybody attack another?
I do support strong self defense training.
Guns and ammo for everybody.